The one DF article I remember seeing recently is "Why Can’t We Screenshot Frames From DRM-Protected Video on Apple Devices?" and it seemed like just a fluffy post without any technical info and without any research, just an excuse to dog on other operating systems.
Why do some setups allow screenshots and some don't? His post starts with "I’m not entirely sure" and doesn't get better from there. You can google "what is widevine" and get better info. In reality, different browsers and different OS's are certified to different Widevine levels, depending on whether the content goes through a sufficiently protected hardware path. But in Gruber's world, "streaming services somehow don’t care about what Windows users do" (spoiler alert, they obviously do), and you can take screenshots on Windows because "Windows uses a less sophisticated imaging pipeline" (naturally, because it wasn't created by the sophisticated Steve Jobs!)
These posts are the tabloids of the tech world, and uninteresting unless you need a source to cite to win an argument about why your favorite computer company is morally superior to all the other computer companies.