They didn't "adopt the same model," they were purchased. Almost all bootcamps are owned by companies like Kaplan and the University of Phoenix. I think Lambda School is one of the very few surviving independent ones, although its reputation was so atrocious that it was forced to rebrand.
The other independent program that comes to mind easily is Ada Academy, but it accepts something like 20 students per year out of hundreds of applicants, so it's not a realistic option for basically anyone looking to enter the coding trades.
