The support Japan had for cryptocurrency increased around 2016/2017 when China decided to ban cryptocurrency, and that was even when the cryptocurrency market started gaining much support from Japan, lots of experts then claimed that much support came from Japan and that helped the price increase then. So Japan has been one of the major countries that are backing cryptocurrency right from time. I didn't know About the Hong Kong, but I do know that Singapore is another country that supports cryptocurrency as well. These three are not the only ones, there are others as well.