There are other considerations too, like that fact that I often got notifications that someone joined Telegram but that person was a friend of a friend and not in my personal contact list. One of my friends works for an actor's agency and then I got notifications when some of his clients joined the platform. I'm pretty sure they weren't aware of it and from a privacy standpoint this is very questionalbe and left a very sour taste. I always feared that I missed a privacy setting and am exposed the same way.
