I do not think the sites are really using AI, if they were it would be easy for ACR and BetOnline to catch the bots.
Players might be illegally using real time GTO, but I dont really think AI is an issue.
AI can be very useful for improving your game away from the table, for example if you believe its right to open limp with players sitting out you can ask AI and will tell you its a horrible play. Or you can ask AI if you should limp to a 2 blind stack on the bubble and fold to them and it will tell you no. Or you could ask AI to explain ICM to you.
AI really has no limit on how much it can help improve your
poker game.