Messaging software that force you to have a mobile phone

Chat programs that don't have a proper web-only operation and force you to have a mobile phone, e.g. WhatsApp.

Heck, even Signal, which is supposed to be super secure and good for your privacy, forces you to disclose your freaking cell phone to all contacts! lifehacker.com/how-to-use-signal-without-revealing-your-private-phone-1818996580

What is my phone breaks? What if I don't want to have a fucking phone? What if I move countries and have to change the fucking number? Also evil but less because done by all: chat programs that can't send you an email if you don't see the message in X minutes.

European Union, time to force those evil companies to use support open standards like XMPP?

The solution to "how to prevent spam" is simple: your ID is a public key that you own the private key for. If you start getting spammed, generate a new public key, and send it to all contacts, and dump the previous ID.

OK, you have to share your phone with the company to prevent spam which forces us into messaging software that force you to have a mobile phone, but why do you also have to share your phone with contacts? So you are then forced to give your phone number away on the Internet.