Earlier quoted context omitted.
I think their concern is paedophile rings using large group E2EE for live child abuse with completely anonymous accounts.
Yeah - I'm pretty sure this is the real concern and verifying a phone number is reasonable trade-off. I know this argument is often quickly dismissed on HN since people see child abuse or 'going dark' as an easy excuse for the government to leverage to get more control (and it has been used for this), but that doesn't mean the problem isn't serious or doesn't exist. See this: https://www.nytimes.com/interactive/2019/…
Lower privacy "because security" is not a reasonable trade-off. It should not be. See also: https://en.wikipedia.org/wiki/Four_Horsemen_of_the_Infocalyp...