I know a number of tremendously successful self-taught software folks. But as has been explained above, they're kind of the exception that proves the rule.
Its not that a Bootcamp grad can't make it in the industry, it's that you can't expect a wildly successful career with *just* Bootcamp.
The guys I know killing it in software who have virtually no formal education in it are guys who basically grew up speaking coding as their first language. This meant they had years of professional experience under their belts before the CS guys even graduated, and they were moving into senior roles in their 20s before the CS guys got their first promotions.
Back in the 90s when I was in highschool, it was a small minority who were computer savvy, and in my circle, those guys lived ate and breathed their computers and software. One friend was recruited by a major software firm at 16, another was recruited by the government at 18.
My point being, there is no limit to what a self taught software engineer can achieve professionally, but the ones who achieve aren't operating on only 6 months of training. A Bootcamp can be a great first step, but to make a solid professional go of it takes learning A LOT more than that.
It can absolutely be done, and for really talented and self directed people, it might be the better and more efficient way to go, but that path requires a lot of self-motivation to be able to compete with the far more formally educated.
A family member lost his job due to covid and was thinking of one of these Bootcamps to switch careers. He really was thinking of it as "I'll do this training and then have a whole new career" as if it was a substitute for a full degree. None of our family was overly supportive because he showed no real passion for it, and wasn't quite realizing that it was really just a "primer" education.
So my take on it is: if you are passionate about software, talented at it, and highly motivated to learn on the job and in your spare time, then a Bootcamp might be an ideal option for you, perhaps even a smarter path than getting a CS degree.
However, if it's something you're considering because the education is short and software seems like a reliable career, then I would go into it with rather tempered expectations of career outcome.