Okay, I never got invited by a guild with some "strange" name like in the whispers I always get, but I got invited into guilds while leveling a lot. I'm not the person who like to join some random guilds, I like more to be leveling alone. But what if I would not be such a person - if I would be more like a person who accepts the first invitation, because "why not"? I don't want to attack the staff, because they will have reasons and some more insight in things we/I don't have - but for me this kind of behaviour (banning all members) could hit people who did nothing wrong (especially new player like me).
To be honest I was more surprised that everyone in this thread seems to know about this and that OP joined the guild although he knew they were kinda shady.