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I would expect it to work on detecting the mismatching of content for types of communities in general. For example, preventing pictures of cats or giraffes being uploaded as a product photo on Poshmark when it's supposed to be a pair of shoes.

That type of check should become standard in a short amount of time for all communities that accept photos (that isn't meant to be general purpose, eg Imgur).

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For example marketplace (where you can sell items on Facebook) will suggest a category for the item if you upload a photo.

I can't wait for Facebook marketplace to fail. The constant stream of useless ads is obnoxious. I am using Facebook less because there is no way to block that low quality content

When could counterfeits be detected with a somewhat decent accuracy? Is it something that has been attempted?

I checked out Facebook Marketplace a few times since the launch and and everytime I'm just overwhelmed by the sheer amount of better or worse counterfeits.

On top of that I start getting notifications more counterfeits, for a short while I reported them but after a while it felt pointless and now I just ignore the marketplace tab.

A few craigslist competitors are using CV to detect drugs/weapons/animals.

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