Nowadays the homeless or other less-than-living-wage earners do that for us. You can see them everywhere in cities all over north america and europe if you pay attention.

As European that is not spread everywhere, while you can get some money back in Germany and Greece, there is none to be had in Portugal.

In Germany, it is such a big issue with people not having other source of income, that there is a culture where and how to leave the bottles around so that they are easier to collect.