I do not have reference handy, but recently read (on HN itself, I guess) that there is lot of interest among programmers living in "limited-opportunity" places in India to work on Bug Bounty programs. Obviously, one reason is time on hand. Other motivation could be the bounty itself. Even < $100 bounty is significant income. Thirdly, this honor badge is a ticket to a job interview, if not a job itself, in companies in bigger cities and possibly a better quality of life.

Again, I am theorizing without providing references.