And if so, why exactly? It says it's end-to-end encrypted. The metadata isn't. But what is metadata and is it bad that it's not? Are there any other problematic things?
I think I have a few answers for these questions, but I was wondering if anyone else has good answers/explanations/links to share where I can inform myself more.
Your address book is uploaded to Facebook servers when you use Whatsapp. And each time you interact, they know with who and link this information with other profiles and users of the Meta products.