I also find it a bit absurd to suggest that there is a connection between population and the banning or acceptance of bitcoin. But I also disagree with you saying that poor countries can't afford bitcoins. You should remember, no one forces you to buy 1 full bitcoin, you can buy as much as you want, depending on your financial ability. Bitcoin is for everyone, including the poorest, it's not discriminatory or just for one person.
Pakistan average monthly salary is $210 [1] and monthly cost of a single person in Pakistan is $287 [2] which mean if you're just an average people in Pakistan, you're not enough to pay your monthly needs, how you can have a money to start invest in Bitcoin?
The Bitcoin fee is already hurt you, poor people can buy Bitcoin, but buying Bitcoin with small amount money has no benefit. Bitcoin is for everyone, but it doesn't make sense if your financial aren't stable, you want to buy Bitcoin.
[1]
https://bdeex.com/pakistan/[2]
https://www.numbeo.com/cost-of-living/country_result.jsp?country=Pakistan