I think (do correct if wrong!) the EU has approved an interoperability law for big tech companies? So it should be just a matter of time until you can switch messaging app and still be able to communicate with people on wa and big messaging apps
Ofc if all your friends all use whatsapp zuck will still be able to read all your messages and get your phone number via your contacts... so it's only a partial solution. Still better than nothing tho.