So your concern is that someone is unlucky enough to a) suffer 30+ neural hash collisions, b) some subset of those are indistinguishable from child pornography due to low resolution (flesh colored bathing suits), c) those images match the multi stage hash, then d) authorities subpoena the full resolution images, which turn out to be innocuous but they decide to harass the user anyway.

I dunno man, I’m not to worried about this chain of events.