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Photos won't work with this, it works here because text is discrete and provides a limited search space.

“Attacks always get better, they never get worse“ —Bruce Schneier

Yes, but that doesn't mean this particular attack is relavant to the problem space.

What makes it possible to search over font characters but not, eg, convolution tiles?

Photo identification is done with a limited search space of “tiles” that the image is decomposed into, for convolutional NNs.