This is something helpful tbh on my side I won't have to personally message the seller asking if they have alternative modes of payments like Bitcoin (which most of the times they don't) and see if we can deal outside of Ebay. With this if implemented by Ebay both sellers and buyers will find it helpful and might actually move some sellers to open up in other modes of payment since Bitcoin will now be linked to its website. They need to have a good escrow service though as this will be a disadvantage for the buyer if they won't receive any item or receive a bogus one.