I often see chess gambling in the streets, played by some elders. Bets aren't that much and I guess those are just to add more thrill to the game itself and not primarily to promote or intensify the competition unlike with other sports such as billards (not offered by majority of the sports provider), basketball, and football matches.
This is what I was thinking too when I was writing about this post, if it can be done on the streets then it can be done online right but then I see the concerns about cheating in chess using AI, I don't think that it's going to be a problem though as there are AI detection systems out there to determine if someone's cheating and I don't think that if anyone out there would do this, they would definitely have a way to implement this so hopefully we get to see this in the future.