They can also buy bitcoins as keep it as an investment for future to benefit from the price appreciation.
These people already struggle to feed their family on a daily basis, so how do you expect them to invest money that they barely have in Bitcoin? Feeding the family is on the first place at all times.
Correct, they would prioritize first on feeding their family rather than putting up money into bitcoin. They would definitely spend those money first on their priority and dont mind to put up money to bitcoin just hoping for getting money on the future. It would make no sense at all.