The only time I’ve seen this actually work is when the “rent” is set aside as savings. Especially for kids who are bad with money.

Seen it actually help a few friends who paid $500/month to their parents then got their 4 years rent paid back all at once when they moved out. It did help them with getting their own place and prevented them from spending that money on drugs, booze, and other things that you tend to spend money on when you’re 18-25