The original sense of open source is defined by the people who fractured off from the Free Software movement in the mid 90's and created it. It's just "Free Sof

The original sense of open source is defined by the people who fractured off from the Free Software movement in the mid 90's and created it. It's just "Free Software" that has a focus on practicality and utility rather than "Free Software"'s focus on idealism and doing the right thing. It has NOTHING to do with "source available" which is a movement that has recently been co-opting the open source name. "FOSS" has absolutely no requirement of it being copyleft. The MIT license is just as FOSS as the GPL. Many of the free software advocates do have an affinity for copyleft, but they are not mutually exclusive. There are plenty of FOSS advocates who also use and advocate for permissive licenses as well.