I don’t think it is too much to ask to at least send an automated email when you ban an account as to the reason. Should group owners not get a bit more consideration and service? If it is a system glitch then I would expect a notice with a way to have your ban reviewed.
I may have to consider moving my groups elsewhere. Not a fun thing to do. I am sure I will lose a lot of subscribers along the way.
UPDATE – Oct 14, 2008: My google groups account is still blocked. The worst part is that I cannot even unsubscribe from groups!
UPDATE – Oct 7, 2010: After two years google has finally reviewed my account and reinstated my access.