I think it is natural that most bitcoin users from good economies countries, this is because in developed countries all the free information obtained without ever being in censorship or blocking, even developed countries give everyone the freedom to do everything including making coins.
Developed countries made a proper system for the cryptocurrencies and especially for the Bitcoin so they deal with it smoothly without any problem. Country with fine economy can think for better situations to bring in country or implement in country while it is difficult for those countries which are hurt with economy and can not think for better but are working in the recoveries of it.
Yes, they have advance technologies that can use to handle how to use cryptocurrencies and maybe ideas and strategies are available too that is why they are more advance compared to other countries.