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Population explains this I guess. Japan has a big pop but majority is too old or too young, is my guess. Qatar too small,,, most of millions of people there are poor workers.
When i write this reply, the website says
1. United States (1,987)
17. Japan (63)
71. Qatar (2)
So while your assumption makes sense, there's probably another reason (such as many crypto industry located in US) behind such wide gap.
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There are probably many reasons,,, first is cost as we all talked about and this must be relative to income and second is access and technical knowledge and relevance which matters to a population I would say between 20-60. I am thinking many other reasons like English and infrastructure et cetera,,, and others maybe we are not even aware of.
