Free software was coined in the 80s. I wasn't there for that.
Open source was coined in the 90s because we didn't want people to think that software which let you see the code was free of charge.
Then when they sold out a bunch of tech bros from SV decided that they knew best and redefined open source to mean whatever made their valuations go to the moon. The plan did work as expected because dot com crash.
The people around the OSI have always been share croppers that have been trying to get paid for other peoples work.
Was it redefined? My impression is that it has always effectively been a synonym for free software, just not carrying the political leanings.
Also, while I'm sure it's unintentional, your backwards of "sharecropper" smells racist.(It actually means paying someone for the right to do you your own work, and was an attempted to recreate slavery after slavery was banned in USA).
The people trying to redefine anything are those ignorant of the history here.