They have inhuman skills usually paired with terrible game IQ and generally awful toxicity. They get boosted up to play with intelligent players purely because they can hold a button to outplay. It gets to the point where you have a player on your team who has no idea how to play but is mechanically good and it breaks the entire competitiveness of the game.
Cheaters want to dominate other players, feel like they deserve to dominate other players and are perfectly happy for other players to suffer as long as they feel good.
Best I’ve ever seen was some online discussions about motives, but I never compiled any statistics out of random anecdotes (that must be biased and probably not representative).
Are players who take advantage of developer-supplied aim assist and other assistive technologies "motivated by a toxic sense of self regard and a desire to humiliate others"?
Gonna have to ponder if people who aren't cheating are cheaters.