How markets in the poorest of countries revolve around circular markets working on about $1/day. How can these people use bitcoin non custodially when each transaction they make on chain would cost them 1/5 of their daily income? If fees ever go above 1 sat/vbyte, I would find it very hard to convince any of these people to use bitcoin. Every solution I can think of involves at least one on chain transaction or custodial solutions.
I don't know in which country people regularly earn as low as 1$ per day, I mean the majority of the population, but if there are such countries, then I'm sure that in such countries people do not have access to computers, smartphones and laptops. They won't also have access to the internet because it's expensive and might cost them 1 week of their salary. Also, with the tech and internet, you have to consider electricity, which isn't cheap anywhere besides Russia. There is simply no way for such a low earner to have access to Bitcoin or informational technologies, so Bitcoin is not really for them.
Btw in the extreme cases, if their friends or close people have access to Bitcoin and these people need to make a transaction, they can use Lightning Network or use an alternative currency like Ripple or Litecoin.