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some interesting excerpts:
The analysis notes that a government can easily tell when a person is using WhatsApp, in part because the data must pass through Meta’s readily identifiable corporate servers. A government agency can then unmask specific WhatsApp users by tracing their IP address, a unique number assigned to every connected device, to their internet or cellular service provider account.
The assessment makes clear that WhatsApp engineers grasp the severity of the problem, but also understand how difficult it might be to convince their company to fix it.
It will be difficult to better protect users against correlation attacks without making the app worse in other ways, the document explains. For a publicly traded giant like Meta, protecting at-risk users will collide with the company’s profit-driven mandate of making its software as accessible and widely used as possible.
“WhatsApp has no backdoors and we have no evidence of vulnerabilities in how WhatsApp works,” said Meta spokesperson Christina LoNigro.
That's why you slam e2e encryption banner all over the app to make this statement even more true instead of doing an independent code review that could confirmed that on paper.
I don't agree with that, take a look at this:
Officially supported devices and the list of unofficial /e/ builds part1 and part2 (those might not be working as good as official builds)