They are educated. Also more are online. And they have easier access to Bitcoin.
But Bitcoin ATMs are not measure of Bitcoin adoption. There are some countries with a lot of Bitcoin users and have zero Bitcoin ATMs. Regulations there just had not kicked in.
People within the countries with good economy have the liberty to invest, they don't experience poverty so their savings could be going to investments like crypto. Most of the users of crypto are investors, that's the reality, we are in the early phase so this opportunity is seen for people who think digital currency is going to be the future of money, and crypto stands a chance to succeed due to its unique feature of decentralization.