I'm no legal expert, but that seems difficult for a court to do. They're not legislative (or, not supposed to be). And I'm certain the ACLU would fight that too

I'm no legal expert, but that seems difficult for a court to do. They're not legislative (or, not supposed to be). And I'm certain the ACLU would fight that tooth and nail. Signal was subpoenaed in court, and told to give up information[0] on certain customers. They replied the only information they had was the time the account was created and the date of the last connection. Admittedly, this was over 5 years ago. They fought to get these court records released. [0]: https://arstechnica.com/tech-policy/2016/10/fbi-demands-signal-user-data-but-theres-not-much-to-hand-over/ https://arstechnica.com/tech-policy/2016/10/fbi-demands-sign...