I don't believe in game-fixing in the NBA although there were rumors that there is a syndicate that is inside the NBA doing such a thing although there was concrete evidence about it, when I was in high school there are rumors circulating that the reason MJ father died is that MJ refuses to drop the game, which I think is speculation, I'm not sure.
If we don't know about rigged or not, maybe we don't have to think about that because that will need evidence and not just rumors. We can not prove that because I think if that really happens, any high-level officers will hide that from the public because that can make the organization will get critics. As a popular game, I guess there will be a syndicate inside the games, even if we don't know if that is real or not.