Since no one has answered let me try:
Could you explain what happens when a user is banned and under what circumstances they can later reappear
- A user may be banned temporarily or perma. If temp, then he will be able to login after 3 days or so
- What happens? My guess is that he can't login. Perhaps someone who has been banned can answer.
There are some banned users who have possibly returned to the site under a different user name.
Firstly, is that the case in your experience?
-That is very possible. Usually the second user name is caught sooner or later and banned too.
Secondly, is there anything to stop a banned user from merely using a new IP address?
-No. That is (I believe) the way they do it.