That’s why I put it in terms of how much they care. I’d be surprised if there is something on the Ethereum chain itself because it’d cost a small fortune but if there was, the authorities could easily require all companies to block access to those records, filter network traffic for all but the most determined users, etc. because it’s a complex always-on network system with a fair amount of volume.

The underlying problem here is discoverability. If I can find your content, so can the police. If sharing it is personally risky, most people won’t and they feel who do won’t for long. Censorship has never relied on absolutely preventing anyone from saying something prohibited — it’s always the potential for retroactive consequences. This is why successful movements have generally needed outside support, anonymous communications (e.g. printed samizdat which is most risky if they catch you when you’re actually in possession of it), or some kind of social network which is hard to infiltrate (family, religion, etc.).