Might be a bit more than you think. I’ve been using signal for some work chats, as it is a fully functional app no one I knew was using, so it made for a nice silo.

Since the term change, I’d say maybe 10-20% of the contacts on my phone have installed signal. It notifies you of new contacts. I don’t know if they’re chatting, and no one has actually used it to message me, but the group I’m seeing is far beyond some technical niche.

Whether it dents whatsapp is another question.