You mean like Matrix or XMPP? They just aren't as ubiquitous as email unfortunately.

At least you can bridge WhatsApp and then use whatever client you like.

how to?

I mean I know that I can google it up but I'm looking for a working example. I found some code in github that is obsolete. Also whatsapp requires phone code and qr scan so looks like it's designed to prevent a server-only bridge.

I got it running with NixOS https://github.com/benjajaja/nixos-rk3588/tree/main

WhatsApp does work, I use it on a daily basis. The bot/bridge makes it easy to log in with the QR code. You need to keep the phone app as you need to open it at least once a month or so.

HMU if you need more info.

thanks!

Europe has already forced meta to make WhatsApp open. It’s just that no other app has expressed any interest in interoperating for obvious reasons.