The authority on word definitions is a dictionary, so that we don't have to argue like that.
This definition seems suitable: https://www.merriam-webster.com/dictionary/open-source
This definition seems suitable: https://www.merriam-webster.com/dictionary/open-source
Fortunately, most modern dictionaries recognize that languages evolve, using a descriptive approach, updating definitions when needed to reflect how words are actually used.
https://en.wikipedia.org/wiki/Dictionary#Prescriptive_vs._de...