I think expecting it to scale is really the main problem. There's clearly more than zero people for whom a coding bootcamp is a great fit, but it shouldn't come as a great surprise that maybe that pool of people isn't huge.
The reality for the program we use is also that these individuals have a very strong support network of people who can help them while they’re not working for X months. And that is with a stipend.
In addition to drive and aptitude, there is a very large situational aspect to this approach that further refines the funnel.