I never used matrix or bridges so I don't know what that means. Do you still need a whatsapp account? What do people using whatsapp see when you send messages to them? How does encryption work if you bridge something like signal, if there are "bridges" for other apps out there? Can i bridge viber on my phone and avoid the annoying ads that way, how reliable is it?
I've been reading a bit about it, it sounds good in theory but I'm not sure most people are willing to selfhost (since otherwise you're just trusting another party with your data anyway) and maintain all these bridges for something as crucial as day to day communication that should be stable. It kinda wraps it all in a single point of failure as well.
Still seems like the EU legislation could be a better option, if I can just interface with everything through signal or telegram.