Also remember AOL server with Philip Greenspun?
I would wager that more people learned to code via a bootcampish route (especially between 1995 and 2005) than through CS/SE degrees.
The before the dotCom bubble burst there were advertisements for Java/C++/SAP/ASP/W/E++ programming certificate courses on every website/newspaper.
Then there was a consolidation period with CS degree again becoming some sort of a filter pre-requisite and now where the "demand" at least for cheap(er) labor (and labor with 50-100K+ in student debt can never be cheap) bootcamps are touted as the next best thing again.
The only difference really is back then those certifications could actually easily land you a job because companies would advertise specifically for "XYZ certified programmers".
Now it's LF Full-Stack Engineer 19 years of experience in some framework that is 2 years old and is going to be in perpetual beta until its decline.
Thats not saying that bootcamp graduates won't find a job, they'll just be thrown into the same recruitment hell pool.
Go back to the mid to late 90's to early 2000's and there were tons of them usually branded under one of the large IT/Tech companies like Sun or MSFT.
Java programming schools were very popular same goes for .NET/ASP the only difference now is that bootcamps are slightly less vendor oriented but they are still usually not stack agnostic.
12 Years ago you would go and pay for a "bootcamp" to get a Microsoft certification for .NET or some Java developer cert, now you just call it a full stack bootcamp.
MSFT went also even beyond that, in the early to mid 2000's they run programs in many countries that would focus on high school students for free/huge discount you would get to do MCSE/MCPD as extra credit classes after school.