Just before COVID I did some lowish volume selling on eBay of an imported official product. They are "second sourced" aka "badly cloned" by a couple of Chinese crap shifters as well. I had to fend off various counterfeit reports and even people in China buying them with shill accounts, then cancelling the order until my listed stock was depleted. My eBay account was suspended twice within a month.

Eventually I gave up but I decided I'd spend a few months trashing the market first so I ran a selenium job daily which went and reported all of the drop ship sellers for counterfeit goods. That was incredibly effective. But really I would never get into a fight with a Chinese drop shipper again. I sort of broke even with difficulty. There were no gains.

I'm in the UK and I tend to not bother with Amazon myself now because it is an ocean of garbage which is difficult to find anything half decent on. I tend to go to Argos who have same day delivery that actually works for a small fee on most products or hit the local supermarket. I couldn't possibly consider entering that market as a seller based on the absolutely shitty customer experience.

I use AWS during the day and the quality there isn't much better. The whole org needs a quality and honesty shakedown.

The market is definitely open to an Amazon competitor which has a store front not chock full of garbage, a decent logistics network, returns policy and reasonable pricing. All I hear is people complaining about Amazon's mindset monopoly.