> how differently do people over in the East Asian sphere (primarily Japan) handle

I don't see any other example other than the Japanese? East Asia is not like Europe where the border is blurry and services are interchangable. Even moreso in the context of the Internet. The 3 big economies: China, Korea, and Japan, all have their own search engine, their own messenger, their own payment system (even their own card networks), etc. Cultural exchange over the internet is also not that common, especially outside of Japanese media subculture.

Extrapolating Japanese (and in some capacity Han Chinese) culture as The East Asian culture has long been problematic. Even in the internet era we still maintain each our diverse culture. Hope the author understands that.