Collusion in live poker games in casinos is not a widespread problem. There is a problem with poker where people always think they are being cheated every time they lose. If you are playing in a casino in person it is very unlikely you are being cheated. If you are playing in a regulated website online that verifies the identities of the customers it is also unlikely you are being cheated.
The vast majority of people that play poker absolutely suck and think they are being cheated because they lose money very quickly. Most bad poker players would literally be better off playing blackjack.
A regulated online casino that verifies identity wouldn’t stop a bot. You’d just sign up under your name and use it. If your bot isn’t colluding it would just look to the casino like you’re good at poker.
I used to play poker back in the 2000s. The online game was getting harder then and I can only imagine it's gotten worse? Also GTO solvers are a thing now? I don't know what stakes you are referring to but I feel like the overall quality of poker play has never been higher.
After a few hands, if you don't know who at the table is the sucker, then it's time to leave.
Bingo.
Played thousands of hours in casinos. Saw some asshole show down cards to someone still in the hand, stuff like that, but never anything I thought was collusion.
Plenty of other angles, though.