Phone number privacy and usernames are now rolling out to everyone using Signal version 7.0! Update your app to take advantage of these new features 🎇
https://signal.org/blog/phone-number-privacy-usernames/
In addition to what the other user said, usernames are both optional and easy to change in order to prevent spammers from finding you. Plus, they can only make so many accounts themselves, with the phone number limitation in tow.
But wouldn’t that just put you at risk of spam and other malicious messages?
Don’t accept the message/block them? Same as any other DM system. Or just change your username.
In addition to what the other user said, usernames are both optional and easy to change in order to prevent spammers from finding you. Plus, they can only make so many accounts themselves, with the phone number limitation in tow.