There are some bits in them that would/could rightly be considered proprietary, air/fuel maps, ignition timing, transmission shift logic, etc. I don't see any r

There are some bits in them that would/could rightly be considered proprietary, air/fuel maps, ignition timing, transmission shift logic, etc. I don't see any reason why those proprietary bits can't be segregated from the code we're interested in. So, to answer your question, maybe they do, but probably not by necessity.