We introduced the T+Cs from one major online provider to show how the government violated them. The government stipulated that they had violated the T+Cs and that they had broken the law. Two different courts both stated that government agents are allowed to violate federal and state computer and data access laws to conduct intelligence-gathering operations, and they are certainly allowed to violate T+Cs even when a violation of a T+C is a criminal act (which it is in many jurisdictions).
One thing that is lulzy is that I recently received a letter from one government agency stating that the evidence I had requested by subpoena was no longer available because they left it on a server in violation of the T+Cs and never took a copy of it and the provider deleted the account.
It hasn't reached the appellate courts yet.