That's a good point. But for all practical purposes, Facebook, Reddit, and other major social networks represent what the web means to an average person. Many of them never even open a browser. So those major social networks should be treated more like a public square, for the discoverability that provides, if nothing else. And in the context of sites being delisted and apps being banned (Google, Apple, etc), it would be nice for major social networks to be committed to free speech on their platforms.

I hope there are no legal jurisdictions that are actually CSAM-friendly. But this isn't a unique problem, there are many situations in the world where legal jurisdictions are muddy. For example, when over-the-air television signals can be received across country borders. Just let the law sort it out. Admittedly, it's more difficult for companies that operate in multiple countries, but they're already managing to do it today. The main hope is, that companies will not add any additional censorship themselves, and that an attitude of free exchange and tolerance, would be the default position for more of us than it is today.