Moreover, third parties like Google or Apple have direct access to most of WhatsApp’s users’ chat history. This is because WhatsApp tricked the majority of users into allowing third party not end-to-end encrypted backups. And the sharing doesn’t stop with just these third parties. Apple and Google in turn have to deal with data requests from all the countries they have business in, and so the data flows. As for your metadata from WhatsApp, it is already being sold to advertisers by Facebook inc.