I don’t think this is the problem it is trying to solve but interestingly this could be really beneficial to some very poor countries were the dollar is extremely strong.
It depends on how the money gets allotted. The people to whom $5 is most useful are also the people that most advertisers are not interested in targeting in the first place. So if people are compensated according to their value as advertising targets, this seems like it'll be a rich-get-very- slightly-richer program.