More wrt nostr, but content moderation. There is a tension between censorship resistance and safety (of various kinds). A lot of the content that shows up on the internet is objectionable or illegal. Objectionable content is relatively easy to deal with by using strict web-of-trust filters, but illegal content — especially CP — is very hard to detect, dangerous to handle, and presents a real danger to everyone exposed to it. There are screening techniques that exist, but rely on proprietary databases and hashing algorithms. Open-sourcing those components isn't an option because they're a form of compression, and so always possible to reverse-engineer by attackers. https://about.iftas.org/ is doing some good work in this space in the ActivityPub world.