>>The actual cheater is still getting a signal that they've been detected, because they get banned.

So....yes. But there are mitigating tactics around this, I really recommend looking into it because it's a fascinating topic. As the simplest thing - you don't ban cheaters the moment they are detected to not give off how you detected them. That's why Activision bans people in waves and all at once, even though they know some people are cheating and still active. Unfortunately a lot of people are paying for cheats nowadays, and the cheat makers usually have some kind of refund policy where if you get detected you get your money back - games companies want to inconvenience those buyers as much as possible, so you can't claim your refund straight away because hey, the game worked for a good while even while you were cheating, must have been something else :P

>>Meanwhile the normal user is both confused and significantly more inconvenienced

Yes, which is why the aim is to have 0 legitimate players getting caught by this, obviously.