I've talked to a lot of people coming out of coding bootcamps and I've also talked to or know quite a few who left the industry. I think the main issue is that you get tossed right into the grind after the camp, doing your sprints, being basically a high stress factory worker producing code as ordered. You never get to experience the joy of creation, experimentation, and you never get hired for less conveyor belt jobs due to the lack of interesting passion projects and things to talk about.