Unfortunately, I'm not in any position of expertise on AIs, so I really cannot name them or how many AIs are already in use, either by the providers and/or by casinos.
How I know all these is from my long deep experiences with my few favourite games - how they have been playing and paying differently with each 'new' updates, how one big win became split into 2 or more smaller wins (big wins that I have repeatedly achieved over the previous years of regular playing), and many more instances which I don't need to explain further.
Personally for me, I am 100% certain that my old favourite games are no longer what they used to be. My more recent favourite games have also shown similar drastic changes in their behaviours and patterns of gameplay and payouts since last year and are also no longer the same games that I knew.
Needless to say, new and less experienced players may never see the changes caused by these AIs, because the changes are so subtle to be easily detected or recognised!