Friend did this - BS in physics from high ranked uni, but all the jobs he could get were nearly minimum wage. Signed up for a bootcamp thing halfway across the country that promised job placements after 3 months - sounded quite intense and grueling (definitely seems to target young folk who aren't settled down. Long hours, and they bunked him with like 5 other guys in an apartment.) Since the idea is to prep you for immediately available job openings (companies who fund the bootcamp tell them what languages and stuff they need people to know), they also seem to target the "grunt work" of tech. I think he was saying the bootcamp signs him up for a 1-2 year contract with wherever he's placed at like 10% of salary, and if he left early he'd have to pay back the $20,000 or whatever, but otherwise it was free.
He got a job in the new state, something for an insurance company. Pays well. He likes his new area.
This one in particular seemed like a decent way to go level up from "unemployed college graduate" to "corporate tech grunt" in a year. Others probably serve other needs, but it did what it said on the box.