Hacker in the End

Hey Munchy Mc Team. There is this player on purgatory that has fly and speed hacks. I think hes also using some kind of cheat because he has a lot of Silverfish-Spawners in the end.
I looked him up on forums and found 2 other threads about him, why is he still allowed to play ?
I included a video

IGN: xKaiet
Offense: Cheating and Bug abusing.
Proof: https://youtu.be/SaipM_J5Gt4

Dealt with, thanks.