I would echo v1s comment. The moderators do a very good job as a rule in keeping what is a little bit of the wild west in semblance of order. I have found myself banned on occasion and despite the indignation at the time it does leave you with the opportunity of a little introspection.........
The mods do very well to keep everyone on an even basis especially when some are being a little on the malicious side.
I have no idea what caused the banning of guppy but I believe it would not be without good reason.