Boy... We are going to get spammed.
I never understood the "phone numbers are evil" people, whining about signal requiring them. As soon as this arrives, they will find another thing to whine about.
Hopefully Signal will make it possible to block any and all communications from people wohtout a phone number, unless I reach out to them. And that that feature also be introduced to groups. Because otherwise maintaining public groups is going to be turboshit.