I can provide hard data on this if the original commenter doesn't want to. I went to a bootcamp called Hack Reactor.

My salary immediately doubled and has since quadrupled in the 5 years since I attended. It isn't be a great option for everyone, and not every attendee has had a great outcome. But it can work for those with an affinity for analytical work and willingness to work 70-hour weeks for 12 straight weeks.

Hack Reactor has made their outcome statistics public. https://www.hackreactor.com/outcomes