I think its a bit annoying that there are people who get notified and vice-versa that someone is on Signal. If there is any way to avoid this, that would be great, otherwise what other services are out there that are similar but don't let the world know you exist without you letting them know first?
Better: is there a way the FTC can require Signal to advertise this feature in a clear and conspicuous manner anytime it uses phrases on its website like, say, "An unexpected focus on privacy, combined with all of the features you expect."
It only does that if they already have your contact info. If they already have that info, don’t they already know you exist? It won’t reveal your name, only the info they already have in their contacts.