That would just be a jump from the frying pan into the fire. The real solution to all these problems lies in the use of decentralised services, e.g. XMPP+OMEMO

That would just be a jump from the frying pan into the fire. The real solution to all these problems lies in the use of decentralised services, e.g. XMPP+OMEMO connecting to a private server. This could be the same server as the one hosting any other privacy-sensitive services, e.g. Diaspora or GNU Social or something along those lines. It could also host a private mail server, a private "cloud" server, a private (meta-)search engine and any other services which you'd rather not have data-mined. ...and all that would fit on something like a Raspberry Pi 3B+ nowadays...