They shown the world how to land a rocket stage intact? Perhaps they developed a bunch of new medical treatments that are not actually snake oil? They invented social networks that the rest of the world copied in envy? Introduced touchscreen tech that's actually usable?
Honestly I must have missed all the "big" news in soft and hard tech, 'cause another eBay clone is sure as hell ain't big. It feels like rerun of Japan craze from 3 decades back, only without ninjas and shurikens this time.
If you want to think that there's no difference between PayPal, eBay and modern Chinese versions you are free to do so. But until you've used these things in China (or at least had sufficient imagination), you won't actually know if there is something there.
https://www.youtube.com/watch?v=mZsvJUa9FpI https://www.youtube.com/watch?v=SGJ5cZnoodY http://a16z.com/2015/08/06/wechat-china-mobile-first/
Wechat is great but here (Norway) payments have been a solved problem for years. I'm not even sure I used cash this year at all other than to unlock a luggage trolley at the airport and it's been like that for over a decade. Even the bank card transaction is so smooth, fast (seconds) and ubiquitous that mobile payment services like Vipps struggled to get a foothold.