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.
A very accurate statement, using Bitcoin as their investment in the long term without using Bitcoin as a means of payment, and this is profitable in the long term which can change their lives in the future, DCA is the right thing for them to do and this is a good strategy to accumulate their Bitcoin, there is no problem with minimal income and I don't think this is a hindrance at all.