The players that appear as banned are punished for breaking one of the game's rules. Some players get unbanned, but most of them don't. In the cases when the ban is not removed, the account of the banned player will be deleted in 45 days.
The vast majority of banned players are multis. Locking this because I don't think there's anything else to add and these threads usually lead to discussion of specific bans. PM me if you don't consider your question resolved.