Why or how would eBay (or others) vet all vendors? It’s just not practical. Sympathies to those facing this situation, but usual caveat of “buyer beware“ applies. The buyer needs to check any ratings or feedback for seller, that’s sadly the risk (versus the saving) taken.
It’s not that hard. How does any company vet their vendors? I’m sure EBay goes through a process for vendors they actually buy from. The process for getting a signed SSL certificate requires a vetting process. This doesn’t have to be an anonymous online transaction, it’s just asking for trouble that it is.Again, an almost impossible task.
Imagine the outcry if new vendors where told they had to wait 14 days before they could sell and that they also had to provide background documentation and pay a fee before they could even list?
These online vendors such as Ebay, Amazon, AirBnB do it this way because it reduces their operating cost.
I'm not denying that there's a problem - there absolutely is.
But whilst there is a buying market sellers will sell and places like eBay will continue to facilitate them.
My solution is that I will never buy anything from places like eBay. Even etsy is getting bad, Amazon is getting worse and right now I'm getting the itch to go back to physical stores.
A regulated market has overhead to it— but it’s a shared expense. eBay could vet every vendor or expect their customers to each vet each vendor themselves which turns out to be a lot more costly (as OP is finding). It’s like the health department— we can pay the government to inspect each restaurant and report what they find, or we could all inspect the kitchens ourselves every time we try a new restaurant. It’s a lot more efficient for a single, qualified, inspector to take on that task for the good of the market.
Otherwise they face what you’re describing— more and more people will find it too much of a hassle to deal with and stop buying. Small honest vendors can’t get sales because the prevailing advice is “look for reputable vendors with a lot of good reviews”— but how do you make your first sale in that environment?
Eventually eBay will become a market only from scammers to rubes and the morally ambivalent. Essentially a black market.