We are not in the 1930s.

If you have made it to the point of being a Junior Developer, I can assure you food and shelter is not a problem for them. You just have to adjust to a standard of living like the other 7 Billion people on this world.

Also, if a Junior Developer can show me(or anyone) they have built an entire system on their own and explain key concepts, there is no dearth of jobs for them

This feels like a truism that's easier said than done. In fact, I know someone in that position. They've built things from scratch, they understand things at a deep conceptual level... Oh and they're a math prodigy. How do I refer them to you?