The most important thing about bootcamps, and the reason the best ones produce people who are better-prepared than many CS programs, is because they provide real feedback from skilled coders on the code individual developers are producing.

You can no more replace bootcamps with internet websites than you can replace teachers with books: people need interactive experiences built on sound pedagogy to learn most effectively.

The reason the VC-funded bootcamps are scams is because they call what they do teaching without having any foundations in pedagogy or instruction and using un-qualified recent students as the only "instructors" looking at students' code.