Those people are still working, they just don't know it
If people want to try to make money from their Q&As they can post them on their own site and either charge for access or advertise, but then they'll need to market it to get revenue so then they become like an SE but only for their own content and they'll make very little money anyway. That's basically the position of a professional blogger and very few of those make any real money.
I know we don't keep people out of poverty right now, and that's something that needs to be fixed. But if you think equality of outcome (i.e. eliminating economic disparity) is the solution to that then you may want to read up on the USSR and Maoist China. Capitalism is pretty good at raising the living standard of the whole population, even if it does end up creating billionaires at the same time.
These same people could still be working, since there is no reason they shouldn't be in an office, factory, etc, for a full 14-hour workday. Clearly there is just not enough work to go around, which manifests itself as people sitting around drinking or going on fun Internet sleuthing that nobody would mistake for work.
(well, except that one guy.)