1.You are a staff on a server ,you think you detected a hacker.
You ask the player to say .legit
Hacker bypasses it by .say .legit
You think of another way.
By this I am saying hackers can do .say .legit ETC.
2.You are a staff on a server. You detect a hacker.
You ask the player to say .legit
The player says .legit.
(Because they can set it to , instead . or ~ or anything like that e.g ~legit)
3.Staff on a server. Detect hacker.
Hacker has AntiBan
You try banning hacker.
hacker returns.
No ban.
(Watch out)

The End :3 :P