Read the letter in full (I'm not being flippant, I mean it sincerely), as it addresses this exact issue. There's empirical evidence that people switch off to S

Read the letter in full (I'm not being flippant, I mean it sincerely), as it addresses this exact issue. There's empirical evidence that people switch off to SMS. In places like Egypt, people share phones, swap SIM cards routinely, and Signal's nondelivery behavior is a non-starter. Zeynep does research on this and has written a lot about it; it's fascinating (and depressing) reading. The point is that these are not hypothetical scare scenarios. We have the data and that's why it's so urgent to chastise this kind of reckless coverage.