[everybodyknows]

Buried in the Propublica piece (2021) is the ELI5 of the fundamental uncloaking mechanism:

>WhatsApp reviewers gain access to private content when users hit the “report” button on the app, identifying a message as allegedly violating the platform’s terms of service. This forwards five messages — the allegedly offending one along with the four previous ones in the exchange ...

This may not have much to do with the more specific abuse case of criminal financial conspiracies.

[EGreg]

That’s not the point. The issue is whether Facebook has surreptitiously gotten data you don’t think they’d be getting, and get caught doing it. With regard to video audio and metadata the answer is YES. Will you now trust them with your “encrypted” conversation content?