I would easily say that the old dude with a small stand in the market is the most suspicious. Most of them are frauds tricking tourists and co by the "local artisanal" aspect. In the same way that it is now very hard to find a Christmas market selling authentic artisanal products.

And in 2024, if he does not accept cash, it might probably because he is happy to not declare all his incomes. That is a bad sign if you expect such a guy to be honest to not mess with his honey!