Things moderators cannot detect (and a good anti-cheat can):
-Autoclicker
-Smooth Aimbot
-Triggerbot
-"KillAura Legit"/Kill Aura w/ rotation limit (reduces head snaps)
-Anyone who toggles any hacks intelligently throughout the game
An Anti-Cheat can do so many things to accurately detect the above instances, such as calculating cps (detecting autoclicker, triggerbot, and kill aura w/o random aps) and calculating hit/miss ratio (detecting triggerbot, aimbot, and kill aura).
MCGamer truly needs to focus on improving the Anti-Cheat if they want to eradicate the hacking problem.