Well not every company. But I think you are oversimplifying it. Culture of secrecy in Apple's case most certainly means you can't do anything public at all with

Well not every company. But I think you are oversimplifying it. Culture of secrecy in Apple's case most certainly means you can't do anything public at all without going through a bunch of legalese, approval chains and various other roadblocks. Apple for example did not allow AI researchers employed by them to publish papers - they hardly got any researcher interested and they have allowed publishing of one paper so far. Tesla on the other hand seems to be at least making noises about Open Source spirit. It looks like Musk doesn't care about keeping things secret as much as Apple does - https://www.tesla.com/blog/all-our-patent-are-belong-you https://www.tesla.com/blog/all-our-patent-are-belong-you. It is quite conceivable that Elon Musk will allow Chris more openness to contribute to LLVM/Swift and whatever Self Driving car stuff he is working on. I mean what has Tesla got to lose if LLVM is improved or even if Tesla's self driving software is open sourced (not the data mind you!) and many others adapt it and improve it?