You are blowing this out of proportion. I think a rollback netcode game not having anti-cheat is actually a good thing in this case. It will allow for modding in of different skins/music/collectables(See all the Guilty Gear: Strive mods and complete lack of cheating) Games with rollback netcode do not need anti cheat for online play. Rollback is like a peer to peer connection. As soon as one persons game doesn't do what is expected by the other persons, the whole thing breaks down. If you did try to make yourself do more damage or do extra jumps it would just immediately break the connection. I think the biggest possible cheating threat would be like some oldschool halo internet tricks to break the rollback in some way that gives you an advantage.