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Non interactive zero knowledge allows one proof to be checked by many verifiers. I think folks would still consider that to be a zero knowledge proof no?

That said, yeah this hashing example is not zero knowledge because, among other things, the hash is not hiding.

It's been a while since I read about zero-knowledge proofs, so I wasn't aware of the non-interactive kind. But I read up on them, and as I understand, you have to pre-commit to a finite set of participants in the protocol who can verify that you have the proof.

Which makes sense: If the evidence (that you have a mathematical proof) could be convincingly shared with absolutely everyone, it wouldn't be zero-knowledge any longer. The whole point of zero-knowledge proof is that the evidence is only useful for the recipient(s).

An actual zero-knowledge way to do that would be the Socialist Millionaires' Protocol.

It is n-bit knowledge which is a more complete and valuable concept.