It's certain that there are bots in
online poker today, but IMO when it comes to the big, trustworthy rooms they have the trusted security departments with the suitable people to prevent and tackle the issue.
So, I believe that at these sites the games are as fair, and trustworthy as possible (of course always there will be strange thing in online poker, even if you are talking about the big rooms). When it comes to small, shitty less-known, rooms, then, yes, there are many scam things over there.