Your predictions assume I live in a contemporary, "atomic", social organization where people aren't integrated in tight-knit communities apart from the internet. My core friend group meets a few times a week because of church-related activities at a fixed weekly schedule, to the point where if someone is missing with no explanation they get a phone call. Football night is also at a fixed, weekly schedule with no need for Whatsapp, and I run game night, so...
I was also reading some of the comments in this thread with incredulity. You switch messaging apps and your friends.. just aren't your friends anymore? Not being on a particular platform means you'll be "left out"?
I've seen a number of group chats move platforms because "we need to add X but he's not on imessage, let's use snap instead" etc. I have all sorts of group chats and contacts on various platforms and they move around all the time. A group being beholden to a single messaging platform sounds.. inflexible, and probably not the kind of people I'd want to associate with in the first place.
Yes, like ggp explained its not something people do intentionally to spite you but just how social interaction works.
But you could also turn your argument around if you wanted to - what kind of friend refuses to talk to you unless you sign up for whatever new app they found.
