Video game bots aren't illegal and they're barely immoral. I purchased the game, let me play it how I want to, one could argue. Sure it's probably against the ToS, but who reads that anyway right?
Modern video games - certainly the ones that people care about running bots for - are multiplayer games. Players using bots actively degrade the game experience for other players.
(Besides, people inquiring about running bots on residential proxies usually aren't in it for their own enjoyment. That sort of commitment typically means they're doing it for profit, e.g. to sell in-game items and/or "boosted" accounts.)