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Android technically uses the Linux kernel, but is not GNU+Linux, and has had all the good parts of Linux taken out. I didn’t know iOS was based on Linux, but it’s even worse than Android, locks you so much into Apple’s services and spending money. Freedom over your device is the point of Linux, and iOS fails at that even more than Android, at least with Android you can install custom ROMs.
From Wikipedia:
China Asia 6.7
North Korea Asia 8.2
South Korea Asia 21.2
And it didn’t list numbers for Taiwan