I wouldn't mind if EU made it mandatory for them to be. I really hate that I have to use Whatsapp because it's the sole way I can stay in touch with people I must be able to contact.
I also wouldn't mind "swapping" to contacting my friend via Discord if the federation was made so I could use a different means of contacting them such as Revolt.
I know Beeper exists, but you still need to have account with the platform you don't like and in Whatsapp case's, you need Whatsapp installed.
They did. Signal and Threema just aren't interested: https://www.androidpolice.com/signal-threema-nothing-to-do-with-whatsapp-eu/
Ohh. Damn. :(