Why are images (in and of themselves) illegal? (Not saying they're not, just asking why)

Also, are you advocating for cryptographic signing of notes/content by an external signer? Feasible for those that have them, but horrible UX, especially for those that don't, and it won't end your scenario unless clients are somehow forced out of signing notes.

I do contemplate a future that uses a digital identification system that incorporates some kind of personal signing device for authentication, but that device would have to be individually held, not part of a centralized service. And I don't like that future very much.