Oddbean new post about | logout
 I just read the article.
Basically Meta can see the last 5 messages if the recipient reports the last message to Meta. The rest is end-to-end encrypted. Always.
If you send stuff to your trusted friend, Meta can't see anything unless they're not your friend and report your message to Meta.
Don't get me wrong. I haven't used WhatsApp, Fb or Instagram in years. But I think it's actually a good thing to offer a way to report illegal content.
None of that applies to FB and Instagram. They have no encryption whatsoever and all your messages are read by an AI. 
 WhatsApp currently shares certain categories of information with Facebook Companies.

“We may use the information we receive from them, and they may use the information we share with them, to help operate, provide, improve, understand, customize, support, and market our Services and their offerings, including the Facebook Company Products,” says WhatsApp.

"The information we share with the other Facebook Companies includes your account registration information (such as your phone number), transaction data, service-related information, information on how you interact with others (including businesses) when using our Services, mobile device information, your IP address, and may include other information identified in the Privacy Policy section entitled ‘Information We Collect’ or obtained upon notice to you or based on your consent," it adds.
 https://www.techradar.com/news/whatsapps-new-privacy-policy-requires-you-to-share-data-with-facebook 
 Yeah. That was actually when I stopped using WhatsApp.