From playing poker several times and participating in various poker tournaments in different places, I often think about the possibility of players working together to cheat one player. In other words, collusion, which is unethical and should not be done.

Perhaps for most gamblers here, collusion in poker is nothing new. But I'm curious and would like to know do certain poker sites have sophisticated tools to detect and prevent this kind of cheating?

What should be done to ensure the game remains fair and based on fair play?

https://www.pokernews.com/pokerterms/collusion.htm