Does commercial mean closed source in this context though? It seems like a waste of resources not to provide the source code for an rtos.
Considering how small in size they tend to be + with their power/computational constraints I can’t imagine they have very effective DRM in place so it shouldn’t take that much to reverse engineer.
May as well just provide the source under some very restrictive license.
Dogmatic statements like this lead to bad, messy code. I’m a firm believer that you should use whatever style fits the problem most.
Although I agree most code would be better if people followed this dogma, sometimes mutability is just more clean/idiomatic/efficient/…