Interesting. I'm probably confusing some things. I was under the impression that the term "open source" was older than both the free software movement and "open source" as defined by Eric Raymond et al. Not sure where I remember that from. Thanks for correcting me.
The term "open source" was first proposed by a group of people in the free software movement who were critical of the political agenda and moral philosophy implied in the term "free software"
https://en.wikipedia.org/wiki/Open-source_model