you don't need fast connection to enter in the crypto world, i think more toward the fact that they don't even know what crypto is and surely don't know what bitcoin is
in third countries there is a larger ignorance
I wouldn't call that ignorance. I'd say it's more about people in 3rd world countries are most (if not entirely) focused on the basic needs, for that reason they don't have time (and tools) to research and learn about new things.
In order for the BTC to kick off in those countries, they would need to have basic infrastructure starting with reliable BTC/local currency exchanges. Next thing to do is to enable all those (possibly unbanked) freelancers/local artists/farmers/craftsmen etc to sell their goods/services to the 'western' world using Bitcoin as payment system. That's not easy, but there's a huge potential there.