I literally got Signal because my sister told me to get on it. That's the only contact I have on Signal.
When the Recent Fascist Takeover happened, an American friend asked me for app opinions - I told him Signal was great, aside of the fact that the desktop app keeps getting updated every femtosecond. ...we're still talking over Discord, sad to say.
Signal keeps suggesting I add a contact for my old boss. (Who was a cool guy, but not cool enough to keep in contact with years afterwards.) Actually, when I had an internship a few years afterwards, the new boss's preferred app was Telegram, so, uh, a red flag? ...Yeah, didn't get that job.