Well if I'm correct, there's a Developer on Cube who is constantly improving the Anti-cheat everyday to get rule-breakers banned as soon as possible. Of course there are still some hackers out there who can fly out of their cage (haven't seen them for a long time though) and wait on their spawn island or are going for the eggs in EggWars, but it's about the fact that we have an Anti-cheat and that there's a Developer who's spending his time to make Sentinel better and better everyday. I'm not saying that the improvements are going fast, but I think they are certainly not going slow.
In the meantime that Sentinel is getting better and better, (I'm sure I'm not the only one saying this) you can help the staff and other players by reporting any rule-breaker you see on
https://reports.cubecraft.net with the correct evidence (of course).