I don't think that humans will take kindly to the AI using their GPUs for its own purposes instead of the games they paid for, even if the games do work. People get upset when human-run game companies do similar things, today.

Do people mind if this is done openly and only when they are playing the game itself? My guess would strongly be no. The fact that there are volunteer distributed computing systems would also suggest that it isn't that difficult to get people to free up their extra clock cycles.