Disclaimer: I went to a Toronto bootcamp for evening Javascript courses. I work in digital analytics, which doesn't involve any development, but the JS knowledge did help for debugging things like Google Tag Manager.
Bootcamps sell the exact same dream to everyone, so it can definitely be hard to separate the signal from the noise.
If you're 18yo and not sold on college, definitely attend a bootcamp. Maybe you'll get hired as a freelance web designer (probably not as a "developer" without more project experience). Worst case, you don't have any offers, but you are much clearer about what to pursue in college. That clarity could add several points to your GPA, so it isn't exactly worthless.
If you're "re-training" after several years in the workforce I'm not sure the model works as well. Bootcamps focus their employer relationships on small shops that are open to hiring very green devs, and probably for well below "developer" salaries. Would the 40yo in your cohort be OK with that?
IMO, learning technologies and platforms is going to have a better ROI than bootcamps. A lot of people join them because they think the tech industry is completely closed to them if they can't solve FizzBuzz or don't know React.
For a lot less money and time, you could pursue certifications for say, Salesforce Admin/Marketing Cloud roles, where your prior experience would be helpful, and not a handicap because it didn't come in the form of a CS degree.
Don't get me wrong, motivated and hardworking people will succeed at a bootcamp. But there will be some who, halfway through the program and several thousand dollars poorer, realize that front-end development isn't for them.