is 2 user in 1 acc prohibited?
if the 2 users using the same ip address but announce the one that using it was 2 user

2 players may not use the same account. That's account sharing and it's bannable.

1 user on two accounts is allowed except in official servers where you gain tc per win or in tourney servers.

but...i've seen a player name threedog2 were used by 1 guy and his brother