At least here in Germany it is like that. if you got a new number or whatever you are 99,9% certain that number is on WhatsApp it’s inevitable its the main source for chatting for everyone. So if you’d want to switch platforms youd have to convince a lot of people and most would not be ready to do that since why bother when you can just use WhatsApp?
This is true I wanted to play magicka 1 with friends but he couldn’t launch it on his windows pc while I could launch it without any problems on Linux