If Telegram receives a valid order from the relevant judicial authorities that confirms you’re a suspect in a case involving criminal activities that violate the Telegram Terms of Service, we will perform a legal analysis of the request and may disclose your IP address and phone number to the relevant authorities.

Does this mean a warrant? If so, then I don’t see an issue, since it complies with our constitutional right to privacy according to the 4th amendment. It’s better than I can say for a lot of transactions between private data firms and law enforcement departments.