I don't know much about bootcamps, but there's a lot of hand-wringing in the UK about people working for free ("unpaid internships") in newspapers, high arts, TV and politics. Because it ends up that you can't get into those industries without spending a year working for free, and the only people who can afford to spend a year working for free are people with rich parents, so newspapers, high art, tv and politics end up dominated by the rich.

Admittedly, in the SV programming climate this is not currently much of an issue.

People getting taken advantage of?

Because it becomes harder for potential teachers/tutors to compete with free?

There must be a reason why people volunteer to do something. People wouldn't volunteer unless they thought it's good for them too. If it makes harder for someone to compete - great. Compete better.

open-source software makes it hard for commercial software vendors to comete

well they ain't see nothing yet, when education moves more and move into the web that profession will not support the numbers it does now.