It's better for such poor people earning very little amount of money and only have $1 as their disposal income not to use bitcoin for payment method but use bitcoin as long-term investment. If they continue accumulating with DCA overtime, they can use their bitcoin investment to upgrade their financial situation in the future. Bitcoin is best for the poor as an investment and not as a currency to use for payment.
Absolutely no reason for somebody that is poor and owns Bitcoin to use it for payment transactions because of Bitcoin transaction fees, Bitcoin is not favorable for very small transactions. Bitcoin investment is recommended for everybody both the rich and poor, they can buy according to their financial capabilities and hold for a long time to be more profitable. A person that earns very small income that wants to do DCA method of accumulating can be saving the money and when it increases to a certain level then they can use it to buy and continue the process all over.