Terrible.

I was banned on Airbnb once. I tried to recover my account (with bonuses worth 3 weeks at a hostel) for ages. I didn't succeed. Since that time, I feel pessimistic about talks to the support.

At least, you have your DO cards. But you will need a long time to recover CS collection. :( Depressing.

From time to time, I concede early for different reasons on weekdays. I thought this is my right to choose how to play and when to concede. I will be more careful after your story.

Is banning people this easy for them not to double check?

Probably, they ban hundreds or even thousands accounts every month, maybe they are overwhelmed by malicious activity and trying to solve this problem with the help of algorithms and programs with minimal human intervention.

And just an idea - maybe wrong or maybe correct... When you talk to GU support, don't forget to mention that you blog about your GU experience, mention the link to your blog on Hive. Not for boasting but as an indirect evidence of your trustworthiness and loyalty. In the world of bots and anonymous faceless users, it may give a good impression. A good impression can make the support spend a little bit more time on you and be less categorical.