I'll continue to restate the thing that made me immediately quit Signal forever - I made an account, and 10 minutes later, it had alerted someone I hadn't talke

I'll continue to restate the thing that made me immediately quit Signal forever - I made an account, and 10 minutes later, it had alerted someone I hadn't talked to in years that I had an account, simply because they had my phone number at some point in the past, and they messaged me. For a nominally privacy focused app, for them to literally alert people to my new Signal account I'd gotten to securely message someone violated all trust I had in them. What's to stop someone from just adding a Contact for every single valid phone number on their phone and then getting an alert for any time anyone makes a Signal account? I may as well just use Facebook then.