This article pushes a misconception that there are only two or three FLOSS licenses out there. There are dozens and dozens to chose from today and even older projects once licensed one way can convert to be licensed another way. Mozilla makes its code available under either the file based MPL or the more popular full copyleft GPL and that is the result of a multi-year project led by Gerv Marham to find all of the MPL contributors and work with them to get their agreement to re-license under both MPL and GPL. No project is "stuck" with a license and there are far more licenses and combinations out there than the few mentioned in this article.