Suggestion: Drop hints on social media that you are "helping," or know of, suppliers of fake COVID tests and vax passports. Make it seem like they are everywhere and people will lose faith in their validity. They will abandon them soon after that.
I'm not so sure, but if there is a chance it will help, why not?
I'm still trying to find these black market people. Since I'm not a career criminal I have no clue where to find it. ;)
Liberdon is a Mastodon instance for libertarians, ancaps, anarchists, voluntaryists, agorists, etc to sound off without fear of reprisal from jack or zuck. It was created in the wake of the Great Twitter Cullings of 2018, when a number of prominent libertarian accounts were suspended or banned.