e.g Australia, the servers are made up of the Asia Pacific region from Japan to Tasmania all with different time zones which mean that there is not "peak time" and so when life's demands interfere with game time server population falls.
This made me lol a little. Think you need to take a geography lesson. Japan and Tassie are pretty much the same timezone, only 1 hour difference. The maximum time difference for players on our servers is about 4hours. There will be some exceptions to this, but I would say our peak time is about 8pm-12am server time. Not much different to any other servers. Infact any q after about 10pm is a big long wait FPs and WZs.