like everything else on Signal, is also end-to-end encrypted

That’s fine if one of those ends isn’t a public activism group.

If you don’t want your name and profile picture shared with randos, either don’t set them

I use Signal to talk to people in real life, both personally and professionally. I don’t want to message them from some sort of unidentifiable alias.

or don’t chat with randos.

That was my point, thank you.