I don’t think anyone wants to get banned in COD Mobile on purpose, really. But there are a few who like to take risks with cheats and sooner or later get banned eventually. Like most other battle royale games, Call of Duty: Mobile also has an anti-cheat system in place that catches players with hacks on and bans them from playing the game.
There have been several reports of hackers spoiling the game for genuine players by using aimbots, speed hacks etc. In fact, if you Google up about this, you will find countless players complaining to Activision to tighten their anti-cheat system ban cheaters for life. COD Mobile has millions of users and out of those, a big chunk use unfair means to win matches and rank better.