What does it mean when I see something like this in the banlist: I accidentally typed in siku instead of snowy15545. Like they banned themselves but typed in siku or something? I've never understood that.

Some admins/mods/GMs (staff) have their account protected. If somebody fails to log in to one of those protected accounts, their account gets banned.

This is only a theory: The IP is compared to toribash database and the most used account logged from that IP gets banned.

Ohhh. So they get in trouble because it was an attempt to get into a gm's account. I see.