For one to trade with Bitcoin certain factors has to be put into consideration first and must be available-
Knowledge which they say is power
Adequate information about the transaction process
Constant power supply
And of course data and the financial strength to acquire the initial BTC
The above factors are the constrains of people from poor economic countries.
The opportunities available to the people in the good economies far overweigh those of the poorer economies. Exposure to information too, is another factor. From a younger age, people in the good economies are exposed to internet, ICT etc. While those fro poorer economies get this at an older age.
Indeed, people who live in good economies, they are eligible for exposure to new technologies from a very early age, they have more time to study and research while with poor economies, their time is spent on making money, they do not have time for new technology. In addition, with a good economy, we can easily invest in bitcoin, we do not need to worry too much about the risks, everything is under control, and so, we do not need to be surprised when bitcoin users are concentrated in most countries with good economies, their superiority is too obvious and overwhelming