It seems this is what you get when someone who wants to learn more about a handful of technologies grabs what is readily available and well documented. They are

It seems this is what you get when someone who wants to learn more about a handful of technologies grabs what is readily available and well documented. They aren't creating hardware products. They took a few hardware items, pieced them together, and put it online for others to peruse. This looks like the path of least resistance to creating a cool hack.