A former colleague of mine who was a distinguished academic and successful tech executive grew up in East Germany. After the Berlin wall fell, he was able to enter the building where they kept the dossiers. He found his own file and was astounded by the information they had on him. His friends, his work, his habits. Photos of himself going about his business. His social circles. His friends were equally shocked by th…
Isn't the difference here that you have the freedom to leave or not use Whatsapp if you wanted to? Even the supposed FB shadow profiles would be hard pressed to reconstruct habit information.
Leave facebook, you miss information your friends and family post to facebook because that's enough.
Leave whatsapp - you now can't message with encryption to a large number of your contacts.
But yes, absolutely you should have signal. Everyone should. That's not the reality we're faced with. Whatsapp message to Dad is better than plaintext - that doesn't mean facebook can be as crooked as they like when they provide that.