I can see how it'd be trivial to block known celebrities, but how do you handle everyone else?

> trivial to block known celebrities

see here for one example: https://news.ycombinator.com/item?id=47370100

Do you need to? It doesn't know everyone else. Or at least it shouldn't.

I mean a realistic take is to simply not use source images containing people at all.

AIs have been able to invent fictional people longer then they've been able to modify existing images.