I don't understand why cheaters are such a problem when it comes to bans. Why ban them? Flag them as cheaters behind the scenes, and let them only join cheater

I don't understand why cheaters are such a problem when it comes to bans. Why ban them? Flag them as cheaters behind the scenes, and let them only join cheater-only servers. They'll stop soon enough. It's like telling a web scraper that its IP was banned. It's stupid cause you will have nothing to gain from that strategic move. A better way is to flag a web scraper IP behind the scenes, and give them only garbage data, randomly injected/inserted into the pages. That'll teach them not to scrape your website :D In my opinion the same goes for cheat detection. You will only lose the strategic advantage you have by banning them, because rotating IPs or CD keys or accounts is just a minor inconvenience for them.