The electronics labs at university have $10,000s of equipment for use in electronics engineering courses. And you need instructors with experience with both hardware and software. In my experience those with the required level of expertise earn far more in industry than what TAs are typically paid.

Of course you could always have an Arduino based course. But for anything non-trivial you will quickly need some electronic test equipment and the skills to use them well. You only need to browse the Arduino forums to realise how hard it is to learn all the inter-related material.

Any organisation providing a bootcamp style course would need to invest in considerable amount of test equipment, provide lab bench space and hire suitably qualified instructors.

Having said that, there are lots of videos on YoutTube that explain various topics. You might want to read me reply to @runawaybottle for an idea of some of the topics you might need to become familiar with.