Here are two recent examples of my having to interact w/sellers on WangWang. Top half of screencap: have to confirm address or they won't ship. Bottom half of screencap: other seller waits two days to tell me that the stuff I bought was out of stock and I should apply for a refund (the items are still for sale on that shop btw).

https://twitter.com/briandonovan/status/1125353433110700032