Even if we take into account what they take as the main criterion, China, where crypto trading is prohibited, according to that criterion, it should not be on the list at all - because where does the US company get the data on private investments of the Chinese? Maybe they call random numbers in China and ask people "have you invested in Bitcoin"?
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I quote additional information from the same article source, at the end it is clearly stated that the crypto ban in China has not been effective and there is leeway because it may not be a permanent ban. without the implementation of strict crypto bans then there are still ways to gain access to data from various sources regarding the total population that has invested in Bitcoin.
So for the list of countries where the status of the ban on the use of cryptocurrencies cannot be guaranteed the accuracy of the data because there are more other crypto users who allow themselves to be anonymous so they are not included in the data collection held by local exchanges or the government.