I'd discussed the company Real Authentication with people outside of TPF and we speculated whether they used human or computer authenticators. (In fact, I didn't realize the did Coach! Those I'd talked to had told me about Vuitton and Chanel errors.)
What you've pointed out about AI is in fact, something I've commented on many times over the years that Entrupy, another AI authenticator has been in business.
Unless these companies correct their algorithms when errors are pointed out, they'll continue to make those mistakes. Sellers who use these companies (as well as other "professional" authentication companies who don't use brand experts) are putting a lot of faith in expertise that often, just isn't there.
As shown by the seller's response in the Mercari listing as well as Goodwill's response to the many fakes they've sold that were authenticated with Entrupy, there's a trust that just shouldn't be there.
It never hurts for ALL buyers to verify their items just to be sure they're getting what they are paying for. Most decent sellers shouldn't be offended because a buyer chooses to verify their purchases. In fact, as a seller, I would appreciate buyers who are educated enough to know that fakes exist and to do her due diligence to confirm authenticity.
ETA: The fact that Mercari follows up Artificial Intelligence authentications with human ones is scary because the AI mistakes I've seen are NOT close fakes. These are errors that many novices wouldn't make. But if humans are looking at the items as a followup to AI, Mercari needs better human eyes.
