Go Daddy has a history of pulling registrations without notification to domain owners. Remember seclists.org and familyalbum.com? Those domains were redirected because of third party complaints. The complaints were not even made by law enforcement. The GoDaddy TOS expressly allows them to suspend service at their discretion and they do it at the first sign of trouble.
I'm not defending GoDaddy in the least, but people doing business with them should be aware of their history and policies.