I don't think so as the FBI would not gain anything out of owning SR. Darkmarket was the days before TOR and the carders were causing billions in financial damage. You are getting an 8th of pot in the mail. Not quite as serious, but we have yet to see any real computer saavy attacks by the DEA yet. Darkmarket was obvious people were calling it a honeypot for like a year before the raids and the admins were suggesting that people use highly tracable VPNs... None of that is happening here. FBI wouldn't put a forum on a tor node it defeats the purpose. They would put it on clearnet and block TOR like they did with DZF end of story.