For the most part, they've attached themselves to others willing and able to bear the burden of their existence for them. Adding a person to a house doesn't cost that much, though.

There's a chunk, though, of rich non-workers. Trust fund kids, people who pulled off FIRE, wealthy heirs, etc. Anyone who can manage to scrape together a million dollars can live off the interest if they want. This group isn't really acknowledged by the scolds, though.