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They are also capable of identifying spam so indirectly he confirmed they do read messages.

They don't need to read messages to identify spam: https://techcrunch.com/2017/02/02/how-whatsapp-is-fighting-s...

But they do send recent messages when you report someone.

> Once reported, WhatsApp receives the most recent messages sent to you by a reported user or group, as well as information on your recent interactions with the reported user.

https://faq.whatsapp.com/general/security-and-privacy/stayin...

So in theory authorities just have to "report" and then request the messages.

No, that’s not how it works.

If I have received a message I can report that message.

I see. Still there shouldn't be such option and if it exists then how do you know the client won't be sending messages as if you were reporting them?

You don’t think you should be able to report being harassed or spammed?

Reply on news.ycombinator.com