From what I understand, WhatsApp does have proper end to end encryption, which means messages can only be read by the sender and recipient. It’s a very good thing, and SHOULD be promoted in my opinion.

But that doesn’t mean WhatsApp respects your privacy. Even though the messages are encrypted, the actual app is still collecting and scraping every little piece of info about you possible. Think location, IP addresses, your contacts, what’s in your clipboard, camera, mic… I don’t know the details, but that’s where the privacy concerns come from.