The fact that the parents are providing a roof over their head and paying for their food/water/electricity/internet/clothes/games/etc is why they haven't had a job nor any desire for one well into their 30s.
Honestly, because the parents keep providing for them, there's no impetus for them to change, so they may as well do this into their 40s or 50s.
Minimum wage is enough to survive, and almost anyone that's not severely mentally/physically disabled can do most minimum wage work. In this case, it's not a matter of lack of ability, but lack of willingness.
That said, I have nothing against parents willing to provide housing/support if the child is working, still furthering their education, or need some help getting their feet back on the ground. But at this point, this is none of that, and just enabling their behavior.
I'm in my 30s and have now seen several high school classmates with similarly poor prospects eventually succumb to drug overdoses.
2) don’t assume rich kids don’t opt in to homelessness
FWIW I do have friends that were forced out of the house at 18. At the time I was the same age and I thought it was harsh. Many years later though, I can see that it worked out just fine.
I will tell you it is a LOT more complicated than this. This type of single point simplification and pronouncement about 'coddling' is decidedly unhelpful.
For starters, if you grow up in two working parent household, both parents can easily come home completely exhausted and unable to provide the extended engagement necessary to help a child develop. Add in the social pressures of school where EVERYONE has an iphone and games where it is socially isolating not to do these things - which carries its own set of risks. Add in a public education system that doesn't focus on development and instead focuses on learning material. Add in an economy designed to optimize extraction of capital from individuals through psychological programming and ads and more stuff to buy.
None of this has to have a single source of blame, much of its realistically structural and cultural. It isn't one bad actor or one failed thing...it is a large number of individuals, groups, and organizations individually performing Goodhart's law and the result is some get cast aside.