Says right there in the subpoena “You are required to provide all information tied to the following phone numbers.” This means that the phone number requirement has already created a leak of private information in this instance, Signal simply couldn’t add more to it.

Additionally, that was posted in 2021. Since then, Signal has introduced usernames to “keep your phone number private.” Good for your average Joe Blow, but should another subpoena be submitted, now stating “You are required to provide all information tied to the following usernames,” this time they will have something to give, being the user’s phone number, which can then be used to tie any use of Signal they already have proof of back to the individual.

Yeah, it’s great that they don’t log what you send, but that doesn’t help if they get proof in any other way. The fact is, because of the phone number requirement, anything you ever send on Signal can easily be tied back to you should it get out, and that subpoena alone is proof that it does.