He’s stated that he doesn’t think open source helps produce high quality software and attracts a bunch of people that are less interested in building software and more interested in building policy.

However, he’s stated many times that he will release his language compiler and modules openly when they are ready and that he believes he’ll have to open-source it at some point if he wants broad adoption.

There are many rant videos available online - but in general the core of his software philosophy is based in minimal, clean, extremely optimized code. Open-source rarely results in any of those things. Jon is the last guy wandering in the desert, still devoted to concise code - I love him for it.

I feel like he's barking up the wrong tree, opening up his source code doesn't mean the code will get dirty. He can simply refuse any contributions.