#Signal’s New Usernames Help Keep the Cops Out of Your Data
https://theintercept.com/2024/03/04/signal-app-username-phone-number-privacy/ by @micahflee
"In short, if you’re worried about Signal handing over your phone number to law enforcement based on your username, you should only set a username when you want someone to contact you, and then delete it afterward. And each time, always set a different username."