Considering the term originated with them, it's fair to say they get to dictate what it means.
Terms DO have meanings whether contrarians and the argumentative want to acknowledge those meanings or not.
> Open-source software (OSS) is computer software that is released under a license in which the copyright holder grants users the rights to use, study, change, and distribute the software and its source code to anyone and for any purpose.
https://en.wikipedia.org/wiki/Open-source_software
Citations for this sentence (many more in the full article):
- https://books.google.com/books?id=04jG7TTLujoC&pg=PA4#v=onep...