Nothing surprising in my opinion. USA and Europe leading the pace! Pretty much where the Internet is most advanced we see the most advancement in Bitcoin as well!
Not when it comes to market shares, which is pretty much important asset. Bitcoin exchanges are basically getting bounced up as chinese exchanges dictate, since most of the volume is coming from their direction,
as well as virtually every single hype or drop. Bitcoin nodes distribution is another thing tho, probably because there's no profit to be made there by running one of them.
I find this normal as well. Every 5th person on this world is Chinese so it make sense that with out limited user base, there are many Chinese users, even though this is still a small percentage compared to their total population.
Also don't forget that Chinese exchanges don't have trading fees so they can trade back and forth and raise their trading volumes which I am sure they are doing to some extent!
Echoing that point about Chinese volume. Consensus among traders is that a lot of it is "fake" or spam volume. I can't see any way to properly account for it. The exchanges would have to set fees for us to get a clearer picture.