I'm pointing out a longstanding inconsistency on HN. Every think-of-the-children argument against cryptocurrency also applies to many privacy-focused tools. The loudest commenters in the HN community are anti-censorship, but they espouse the belief that anyone against censorship of money must be a criminal.
He's right. There's no reason, for instance, that CSAM media can't go on the blockchain as a block - and then everyone plays plausible deniability because the "blockchain is immutable". The internet is written in ink, the blockchain is written in unwashable graffiti that many people are taking pictures of to save their own copy of it at any given time.