I like the balance this licence has, it allows for largely
unrestricted use but it requires changes to itself to be under the
same license. It isn't as permissive as MIT/BSD, but also not as
stringent as the GPL. I don't want my work to just be
used/monetized, nor do I want people not to use my work because
they are affected by the licence requirements (to a point of
course; if you don't want to use it because I require you to
publish your changes, have fun rewriting everything.)