Earlier quoted context omitted.
It should be noted that Minix is code that was developed by university researchers. Researchers who are payed for by (primarily) European and Dutch tax euros. Also note that many of that time, energy and money to modify GPL code is not just programming time, but also a lot of legal advice time. With BSD-like license it should be immediately clear what you can do with the code (i.e. almost everything).
This is probably gonna be a controversial view but my experience is this as well: Deploying GPL code is a legal process. Deploying BSD is a development process. We spent thousands of dollars on legal advice when deploying GPL. In the end it was largely as we expected it to be: No significant action was needed beyond releasing the code to the components that we already got for free, with the minor modifications we had…
The GPL does require some extra work, but it's on the technical side, to make sure you're shipping all the source that you need to ship.