I don't really want to discuss in detail exactly what criteria is used to decide who and when to ban, and what information is available to moderators, since that would help people evade detection. However:

 

@bacon-slayer (View Post)

The important thing is not who originally created the account, but who actually uses the account. If your friend uses the account from their own computer and they don't keep voting on all your saves, they probably won't get banned.

 

@thomasxin

Not necessarily, people can get banned after doing it less than 4 times. If I think there's a possibility that the accounts are separate people, I might wait longer before banning. But just because there hasn't been a ban, that doesn't mean that the votes haven't been noticed.

 

"what if you really hate someone's save and you multi-dislike it using multiple accounts?" - banbanban.

 

@Darthan (View Post)

It would look highly suspicious, especially if they do it from your computer or have logged in to Powder Toy from your computer. Also remember that votes should not be based on who made a save, but on your opinion of each individual save.

We are aware of the existence of them. And also of how they might be used for multi-account shenanigans. I would not enjoy investigating the web of accounts surrounding yours and trying to decide which ones are alternate accounts and who they belong to...

 

Don't collude with other people to all vote up or down on particular saves, and you'll probably be fine. 

@ChargedCreeper (View Post)
If it looks like a real account it will probably just get a temporary ban (which may last a while). So it will eventually just expire on its own.

If you want the ban removed you might have to create another account to ask a mod. Or you could ask elsewhere like IRC. Perm bans are almost never removed unless it was an obvious mistake.