You go to the grocery store, and if it’s not Costco, your produce is co-mingled. Is that crazy?

If my grocery store held themselves out as a banana marketplace, carried boxes from a variety of different banana companies and told me to do my own research on which ones are good, sold me a box labeled Chiquita bananas that I couldn't open until I got home, and then after I purchased it, got home, and opened it, it was full of bananas from Shitty Rotten Banana Farms LLC with fake Chiquita stickers on them, that would be pretty crazy yeah.

There is no way your grocery store has lettuce from two different vendors and isn’t labeling the difference.

You could wonder if the distributor is commingling. Milk production, probably. They’re taking responsibility for the quality of the final product, though.

Come on, even if that's true, it's obviously a very different situation.

For one thing, the grocery store is deciding what produce to stock and what suppliers to get it from. They can choose suppliers that have at least a minimum standard of quality. They don't just let anyone on the world slap a barcode on anything at all, claim it's a grapefruit, and put it into their stores.

For another, a large fraction of produce (though not all) is bought in person, and customers can see if it's obviously bad quality before buying it, unlike Amazon where all you have to go by is the product listing for the SKU.

Hands-on plus visual inspection of your avacado to assess quality is obviously different than knowing if your thunderbolt cable will work at all just by looking at the site so what are you even talking about?