@evan WhatsApp's E2EE is only for show. It's documented that Facebook Inc. can decrypt everything e.g. for the purposes of backup. The mechanism by which they hold and give access to the decryption keys is not publicly documented. Allegedly "decrypted backups" reduce this attack vector, but I've not confirmed whether that's the case.
https://security.stackexchange.com/a/145636/47770
https://snee.la/posts/the-workings-of-whatsapps-end-to-end-encrypted-backups/
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