I don't think it's only his philosophy. In fact, before, I would have thought that personal philosophy to be common sense, but it then turns out it isn't. It still bewilders me how it's the status quo that when you buy an expensive piece of electronics, it's never really yours to use as you please. It's more like the companies are lending it to you for a one-time payment. They keep full control. If they want to remove features[1] or brick the product you bought from them[2] or place arbitrary restrictions on features that require no work from them and then charge extra for lifting the restrictions[3], it's totally ok. How does that make sense? Yet it's the dystopia the industry has been turning into day by day, and it's all made possible because of closed source software.
[1] - https://www.techdirt.com/articles/20100331/0128358800.shtml
[2] - https://www.techdirt.com/articles/20150321/13350230396/while...
[3] - One example of this could be Amazon's ridiculous rental of digital books, since it can only work by downloading the file to your device and then charging you more for it to prevent your device from deleting it. Another example is YouTube Red, to be able to download videos the app already downloads for free anyway to be able to stream, and also so that it won't pause videos when you move the android app to the background.