It's rumores ebay is gonna to start accepting crypto payments. Have u heard? I am glad that more e-commerce companies are starting to allow the use of cryptocurrency to pay. It can be assumed that Amazon and Ebay will develop their own cryptocurrency
Some of the merchants in Alibaba had been accepting crypto for years now. But Ebay is much different from that but they could let the users opt out for their own choice of payment at their own risk.
There have been new crypto based marketplaces and these markets would surely put some pressure on Ebay to try something new.