> Someone has received credible death threats

2 points - 1) “credible” is carrying a lot of water in that statement, and 2) your implication is that any activity which could eventually or conceivably involve a lunatic making a death threat is not compatible with any level of privacy.

The second is incredibly disturbing - people have made death threats over E2E encrypted chat channels, therefore we must remove any privacy built in to such a model?

I'll just dodge 1 for the moment since we're discussing an article about those threats. For the second point - I'm not saying that death threats should invalidate privacy concerns I just wanted to stress that the little people are already seeing quite a few downsides so it's important to view this issue with more nuance than a Facebook-like scenario when the privacy only comes at the cost of ad-revenue.