> it is predicated on the assumption that you can easily mangle pictures to NeuralHash-collide with a desired target picture (out of a set of widely circulating innocuous pictures) without deteriorating the visual content too much.

You can. Here is an example I created (with links to more): https://github.com/AsuharietYgvar/AppleNeuralHash2ONNX/issue...

I'm so tired of people suggesting that you can't. Please explain to me why you posted suggesting otherwise.

I've contemplated making some that are also photodna matches, I expect that it's possible. But access to photodna is only through some awful windows tools, and AFAICT people would just keep posting denials even after an example was posted-- so it's not worth the effort at least not worth it just to further the public discussion.