"Open source" and "free software" happen to coincide most times but have different principles and philosophy underpinning them.
This was a schism back in the 90s and open source won out in the long term and free software philosophy is still niche.
Again, this does not "matter" in practice for developers day-to-day as the actual software labeled as open source or free software is essentially the same set of software and same set of licenses (with differences only relevant for nitpickers).
But the whole free software movement is a strongly political and ethically motivated one, considering proprietary software an injustice, power abuse, immoral. Not just a worse model of cooperation or engineering practice. And as I wrote elsewhere in the thread, most devs have no idea about this fact, not to mention having a stance or opinion on it.
This was a schism back in the 90s and open source won out in the long term and free software philosophy is still niche.
Again, this does not "matter" in practice for developers day-to-day as the actual software labeled as open source or free software is essentially the same set of software and same set of licenses (with differences only relevant for nitpickers).
But the whole free software movement is a strongly political and ethically motivated one, considering proprietary software an injustice, power abuse, immoral. Not just a worse model of cooperation or engineering practice. And as I wrote elsewhere in the thread, most devs have no idea about this fact, not to mention having a stance or opinion on it.