There's this guy called MLMC123. He made a second account by the name of MLMC1234. What he does is he plays himself time and again by making one account quit so he can get points for the other account.
Here's the proof:
They cannot be banned unless its proved that they belongs to same IP address
How does it help him though? He doesn't improve his game and as soon as he meets a proper player they'll slaughter him.