The only thing the ban did was it froze competition. They blocked the IPs from Germany and made it so you can't create new ads in Germany. What this did was make it so that people that already had ads were now the only people selling bitcoins in Germany and they could charge high rates because of it. People still connected to the ads via VPN or whichever route they needed to take and once you were logged in you had access to all of your ads and messages anyway.

So by "blocking" it, all they did was create monopolies. As governments tend to do.