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Hopefully never. This does not enhance the image - it makes up a plausible imaginary image.

EDIT: Furthermore the range of plausible imaginary images that match a given input is high (infinite?).

Just need to look at the picture of Fred Armisen to see that this technique can generate a picture of a plausibly real human who bears no/very little resemblance to the original image.

Why not? A recreation that leads to an identification should be enough for a warrant that could be used for a continued investigation.

We could also just pick a random person off the street and punish them - it would be similarly accurate and fair (actually probably fairer - if this is trained on pictures with a certain bias it will return pictures with that bias).

This paper does not demonstrate an enhancement technique but a phenomena which those using inverse methods called "overfitting".

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