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A bit of a strong idea, but what if we just outright say that face recognition is unethical? I have a hard time finding any use that is positive for society. Advertising and surveillance. Given that, what if we try to convince as many people as possible to not research this tech, nor work for any company working on this. You wouldn't work for a weapons manufacturer, maybe the same metrics need to be applied to adtech…
Would that be useful? First, arms industries and even mercenaries don't seem to have much difficulty operating. So, whatever boycotts individuals might practice don't really do much. Even tobacco companies find employees, and no one likes them. Second, we (in practice, eg eu cookie laws) rarely define these effectively. Is face recognition the problem? Let's ID people based on some other markers. You'd probably need…
Think back when Y combinator funded that "installer bundled with ads" startup. They got yelled at for it by a lot of people. It slowly changes things