There was one certain time around 2021 when some sports prediction codes were shared among gamblers, but after the game, there were a lot of winnings, and the betting site cancelled the game due to the many winnings. As of then, I knew of a guy who won about $17k; I can't remember how much he staked then, but the game was cancelled.
Not sure what type of game are you referring to, but ususally when the game is cancelled then there are no winners or losers. If the bet was won and casino decided not to pay out the winnings - then it was nothing but a fraud.
Theres some instances on tennis match that the game is mark as canceled when the player retired on the middle of the game. Some bets are tag as lose if he bets on the total score count while the current score before the player retired is already over the bet.
On his example. I think he is pertaining on old issue that sportsbook cancelled all the bet of the player due to the involvement of user to shady bets such as fixed match and arbitrage bets. Theres no reported issue that casino cancelled match while it is won without a valid reason.