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?

LinkedIn. Our recruiter will contact them /s

Nope, they won't. Recruiters look for keywords and companies on your resume. If someone has built something as a personal project that doesn't count for squat.

If he is really as good as you say, you can literally ask Claude as to how to go about getting visibility.

It's just a search problem now.