IoT devices are generally built and programmed by electronic engineers. They have no knowledge about software security and neither do they care.
IoT is electronics people coming into the software world and building software like it's the 90s.
Security? Forget it.
I've never gone to a bootcamp, but I'd wager that they at least mention security in their classes. College was the equivalent of the PHP documentation that had incredibly insecure examples that people "learned" from.
Edit: pcb design is risky. But the system is very primitive having voltage regulator and single integrated circuit in it. I doubt this department with current performance would survive as independent company.
you'd be surprised to learn how many pieces of code were designed, written and shipped by one man army.
Not in my experience. But it's obviously not the same everywhere.