Well, let's face it, games can be thrown by certain people with financial interest in them.  From athletes to referees to coaches.  Here is an example of one QB in pro sports a while back.  Interesting how the FBI was involved as well.  Also, IMO once a gambler, always a gambler.  Read the following.

From the Wiki on Art Schlichter:

Schlichter was picked fourth in the 1982 NFL draft by the Colts franchise, then based in Baltimore, Maryland. Expected to be the starter, Schlichter lost the job to Mike Pagel, the Colts' fourth-round pick in that year, when he appeared at practice out of shape and in a distracted state of mind. However, he was expected to be the Colts' quarterback of the future.

Schlichter's gambling continued unabated, to the point that he blew his entire $350,000 signing bonus by midseason. Even before the Colts picked him, he already owed bookies several thousand dollars. His gambling spiraled out of control during the 1982 NFL strike, when he lost $20,000 betting on college football. By the end of the strike, he had at least $700,000 in gambling debts. Years later, he said his massive losses stemmed from desperate efforts to make good his previous losses. After losing $20,000 in the first week of the strike, he doubled up the next week and lost again—starting a cycle that would continue for over a year.

In the winter of 1982 and the spring of 1983, Schlichter lost $489,000 betting on basketball games. When bookies threatened to harm or expose Schlichter if he did not pay up (the NFL, like most major professional leagues, forbids its players from engaging in any kind of gambling activity, legal or otherwise), he went to the FBI in March 1983 and gave information that helped get the bookies arrested on federal charges. He also sought help from the NFL, as he feared the bookies would force him to throw games in return for not telling the Colts about his activities. The league suspended him indefinitely, but Commissioner Pete Rozelle reduced the suspension to thirteen months after Schlichter agreed to seek treatment for his gambling addiction. He was the first NFL player to be suspended for gambling since Alex Karras and Paul Hornung were suspended in 1963 for betting on NFL games.

Schlichter was reinstated for the 1984 season but later admitted that he'd gambled during his suspension (though not on football). He was released five games into the 1985 season, in part because the Colts heard rumors that he was gambling again. As it turned out, he had lost a significant amount of money over the spring and summer while playing golf and wrote one of his golfing partners a check for $2,000. The check was to be cashed after the season started. However, when the golfing partner contacted the Colts to see if the check was good, team and league officials feared Schlichter had relapsed. The NFL wanted Schlichter to take a polygraph test, but Colts coach Rod Dowhower had already seen enough and pushed the Colts front office to release him.

It would be Schlichter's last meaningful action in the NFL. He signed as a free agent with the Buffalo Bills in the spring of 1986. However, his tenure in Buffalo effectively ended when the United States Football League (USFL) collapsed. Jim Kelly, the Bills' 1983 first-round pick, had bolted to the USFL instead but signed with the Bills when the league "won" its antitrust lawsuit ($1.00 damages trebled to $3.00); the Bills had intended all along for Kelly to be their quarterback. With Kelly now firmly in the Bills fold, Schlichter's services were no longer necessary. He sat out the 1986 season after no other team expressed interest.

In January 1987, Schlichter was arrested in New York City for his involvement in a multimillion-dollar sports betting operation. He pleaded guilty to illegal gambling in April and was sentenced to probation. That arrest came back to haunt him that summer. The Cincinnati Bengals saw enough promise in Schlichter that they were willing to bring him on as Boomer Esiason's backup. However, Rozelle vetoed the deal, citing the January arrest.  Rozelle let it be known that he would not approve any NFL contract for Schlichter that season, costing him valuable work when the National Football League Players Association went on strike that year. He made another bid for reinstatement in 1988 but was turned down. That same year, he filed for bankruptcy to shield himself from creditors.

In parts of three seasons, Schlichter played only thirteen games, primarily in backup or "mop-up" roles. He made only six starts, losing them all. He threw 202 passes and completed 91 of them. He threw three touchdown passes and eleven interceptions. He amassed a quarterback rating of only 42.6 and is considered one of the biggest draft busts in NFL history. In 2007, Schlichter was listed as the #7 all-time draft bust on the NFL Network's Top 10 Draft Busts episode. In an updated list from 2010, Schlichter was moved to the #4 draft bust of all time,[18] and in a video listing the top ten quarterback draft busts of all time, Schlichter was listed #3, behind JaMarcus Russell (#2) and Ryan Leaf (#1). In 2007, Charles Robinson of Yahoo! Sports named Schlichter the worst #4 pick since the AFL-NFL merger, writing that Colts fans long felt chagrin that Jim McMahon was taken by the Chicago Bears with the very next pick. McMahon would lead the Bears to victory in Super Bowl XX during Schlichter's final NFL season. In 2021, The Athletic named Schlichter the worst #4 pick since the merger, noting that the Colts selected him with McMahon and future Hall of Fame running back Marcus Allen on the board.

Schlichter said years later that he was distracted for much of his NFL career. He went through a messy break-up with his girlfriend before his rookie season with the Colts, and the ensuing depression led him to gamble more. Schlichter believed the accolades he received after his sophomore year at OSU diminished his drive, and the pressure of living up to that praise led him to gamble as an outlet.

After spending 1987 out of football, Schlichter signed a contract with the Ottawa Rough Riders of the Canadian Football League (CFL) in 1988. He was named the starter out of camp and saw his first meaningful game action in three years. However, he suffered broken ribs from a hit midway through the season. The Rough Riders placed him on injured reserve for thirty days then released him.

Schlichter played for the Detroit Drive of the Arena Football League (AFL) in 1990 and 1991, where he was named MVP in the former en route to winning ArenaBowl IV. His AFL success was attributed to his frequent deep passes, which caught opposing defenses off guard in an era when most AFL offenses relied on short passes. Ahead the 1992 season, Schlichter was traded to the expansion Cincinnati Rockers, with league officials believing his popularity in Ohio would generate interest for the franchise. Schlichter helped lead the Rockers to the playoffs in their inaugural season, but announced he was retiring from football that October. Although he said he intended instead to focus on his radio career and curing his gambling addiction, evidence later came to light that Schlichter was forced to retire rather than face being banned from the league for betting on AFL games.