A friend of mine got a data scientist job at a well-known tech company after a summer-long bootcamp. He had previous experience, though, doing some academic-track work in a scientific field. So the training was giving him a more solid background in an area that he was kind of informally nudging into in the first place.

Technically the prerequisites are very loose but the best success stories I hear are usually more like, someone got a STEM degree but actually not all of those degrees translate into well-paying jobs, after this boot camp they were able to shift over to a data science career.