To paraphrase John Gilmore, the internet treats surveillance as damage and routes around it. These surveillance-proof fonts have been carefully designed and tested, and cannot be read by high-end OCR readers.
Sang Mun’s response was more direct — the Korean designer has created four new fonts called ZXX that aim to disrupt the Optical Character Recognition (OCR) systems used by Google and others to analyze text.
The problem is OCR software can be easily trained to recognize these fonts as long as they are static. If there was a way to make the noise be randomly generated on each use it would continue to be effective.