So in the beginning of the presentation Moxie brings up some valid cases where it's good that centralized services can rapidly iterate and improve such as WhatsApp being able to roll out end-to-end encryption with a single update, while email is still not encrypted despite the tools existing to do so for years. Basically centralized services can roll out changes quickly and decentralized ones are more or less set in…
In fact some countries (Russia, at least) require you to give over Government issued ID when you get a new phone number. So it’s directly tied to your real persona, this is not just one country doing that either. I believe it is also a requirement in the UK now too. (They’re combating “burner” phones)