"open source" and "free software" originate in the movement started by Richard Stallman in the 1990s. The hackers of that era embraced his writings and became tireless advocates of FOSS specifically because of the rights promised, the so called Four Freedoms: https://en.wikipedia.org/wiki/Free_software#Definition_and_t....

A variety of unscrupulous business people have wanted to call their software "open source" as a marketing tactic without adhering to the terms of the Four Freedoms. This practices is derisively known as "openwashing" or "FOSSwashing" and is a good way to alienate the cadre of senior hackers who are strong believers in the Four Freedoms, the ones who make FOSS a successful movement in the first place, and garner bad publicity. You are better off avoiding such deceptive marketing practices.