Huh? Nothing stops you from hosting your own server they can’t prevent that

Sure, let them die in their ignorance . Worked great for me.

and most of the time is I need to talk to someone rather than the opposite.

for this you cant do much other that setup a whatsapp bridge or something

i just tell them “if you want to talk to me im on X”, if they care enough they will, if they dont, they wont. problem solved.