> I noticed in Signal that if you allow it access to your contacts it will tell you how many of your contacts are already on Signal

I specifically did not let Signal access my contacts, but some of my contacts contact me on Signal.

Those people that did upload those contacts and being notified that I'm on Signal.

I don't like it.

Its moderately creepy when Google or Facebook do it, but when a service that is advertising itself as the antithesis to those and being privacy conscious I am really disappointed.