Yeah maybe we got the name wrong there - it would have been more accurate to say “Free(dom) Software Matters”. 16 years ago there was little difference between being “open source” or “free”.
Today the majority of software for the internet is “open source” and to a lesser extent “free software”.
16 years ago adopting a non-proprietary model for software was a philosophical or some may say political decision. Today it has become the default.