Originally Posted by
Cheze
if ebay faced the volume of complaints G2A faces about selling stolen or grey-market goods then yeah, I'd expect them to do something about it.
Fortunately for ebay that's relatively easy to do, since there are a lot of opportunities in the ebay chain of commerce to identify stolen goods. Our hypothetical stolen GTX1080 has to be listed on ebay, and auction finished, the item shipped, etc. Additionally, the stolen goods can actually be recovered by law enforcement which for the most part is not the case with cd keys. Ebay/paypal also have pretty buyer-friendly refund policies in these cases, while G2A just keeps your money unless you buy their 'insurance' up front.
Ebay also has the 'verified seller' system which, while not perfect, requires a lot more time/effort to work around than G2A's setup.
a lot of what these scammers are exploiting is the fact that because they can flip keys so quickly on G2A, there's essentially no way to apprehend them in time to prevent the transaction. The original vendor is left with an unpalatable choice between banning a playing customer's key (due to the chargeback) and possibly losing their future business, or just eating the cost (which is the route most of them take.)