If the confidentiality of your messaging is a concern, you shouldn't be using whatsapp anyway or most closed source software. There's mostly no point in specula

If the confidentiality of your messaging is a concern, you shouldn't be using whatsapp anyway or most closed source software. There's mostly no point in speculating, because it will be hard to verify the extent of information leakage from the vendor anyway. It would be better to use signal or element, something that tries to solve the key exchange problem. And if you are even more concerned, run their respective server software on your own hardware. Then you can inspect what goes in and out.