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The face comparison algorithm yields results with a 'similarity' which is a measure (0-100%) of how confident the algorithm is that two faces match. The positive results that they obtained are relatively low similarity (sub-90%). An educated individual would not consider these a good match. You can also ask the API to ignore matches that do not exceed a specific threshold, and this is common practice, but the people who did this experiment did not. Hence the misinformed results and the misplaced outrage.