The key point in all of this is that eBay itself is at the core of the problem: these sellers have figured out a way to majorly scam yet never really be punished at all by eBay. They short-circuit the system ebay has in place to take down scammers (neg feedback, buyer claims, analysis of message communication, tracking numbers etc.)
As I keep posting here: THIS IS A NEW, VERY SOPHISTICATED FORM OF SCAMMING AND IT IS GETTING WORSE FAST.. These are not the ebay scams of years past, and the scale of it is hidden by the effectiveness of the scammers. It's not surprising that all of these scammers appear to be in mainland China because it mirrors what China does more broadly.
And as I've mentioned before, this is like fake news on FB - even though tech companies condemn it and say they will take action, it is a primary driver of traffic on the site, so it runs counter to their business interest to stop it. eBay won't - can't - do anything about it, regardless of what they say.
These are often sellers with thousands of items in their ebay stores with tens of thousands of positive feedbacks, so they are free to scam as much as they like so long as they know how to control negative feedback on their scam listings, which they do near-perfectly (with methods I've described earlier) and at scale - ie simultaneously keeping hundreds of buyers placated for months.
A week after I finally resolved by second ebay scam, I got a generic promo e-mail from ebay with a suggested listing: it was for the same item from the same seller that had scammed me. That just says it all about today's eBay: run with all the humanity and savvy of an AI bot.