It’s amazing how strong the Meta FOMO is. I stopped using Facebook over 10 years ago and never even opened Instagram or WhatsApp, and I really am not missing out on anything in life. My actual friends know how to contact me and they do! And it’s really not that hard to say “Sorry I don’t have Whats App, just call me at xxx-xxx-xxxx.”
If someone is prepared to not be my friend because they only want to communicate via a Meta app, then I don’t see why I’d want them as a friend.