Here in Argentina the government does this all the time. For example, Today they have announced that Nic.ar, the entity that handles .com.ar domains, will start to charge 200 $AR to register a domain. And the guy that made the announcement said "The users were asking for this from long time" (yes, of course, users are asking to pay for something that is free). Source http://translate.google.com/translate?sl=auto&tl=en&js=n&pre...
"For your convenience, all your Bitcoins have been deleted."