> uncensorability

I suspect that this will be a major issue in the long-run. Once these sort of crypto-based logins become synonymous with CP and terrorism, they're going to be shunned by the average person on the street.

Yes yes yes, people use email and whatsapp for the same, but at least there is the option for Google and Facebook to censor or block/ban those users (and it feels like there is increasing legal/legislational tension to try and compel the tech giants to actually do something in this area). You cannot say the same about an indelible blockchain.