I realized that I have a weird antipathy towards bootcamps in my mind a while back, so genuine question: what's in modern bootcamps as they are usually run that you couldn't pick up yourself more efficiently (either by doing a few toy projects before starting a job or in the first few weeks if it's a new-to-me stack)?

I see ads for bootcamps that want people to pay them for a course on some popular language or web stack all the time and I'm never quite sure why anybody would go for these / why you'd even want a course on how to be an "<X> programmer" in your resume.