Do the fins constantly watch Youtube or Netflix on their phone? 35GB on Mobile is quite lot. And that is an average number. Or do they basically use the Mobile Network as the Internet and dont use WiFi at home?
The same for Taiwan, 20GB on average. Once you take into account the lower end of the spectrum using sub 1GB per month, the median number would be huge.
Hong Kong Currently uses ~3GB on average per connection. With Unlimited plans at about $40 USD.
Those difference are mind-boggling.