I’m not totally convinced that the license is something people really need to think about when they’re deciding what software to use, so no explanation or article about this topic seems necessary.
As reviewers it is useful for us to consider these things because it gives us an indicator of the quality and long-term availability of the software. It is also of relevance to software developers, which most readers are not.
I think that people reading Privacy Guides should concern themselves with other factors of more importance, and generally want us to have considered all the minutiae of non-privacy-related things like software licensing before we list a tool on the site in the first place.