The volatility of bitcoin isn't a big problem for these homeless guys because they probably spend it the same day when they receive it, it's more of a problem f

The volatility of bitcoin isn't a big problem for these homeless guys because they probably spend it the same day when they receive it, it's more of a problem for the hoarders. And if the price of bitcoin changes too much then probably the "money making" services adjust they prices accordingly so the next day the homeless receives the same dollar value (in bitcoins) than before.