I would agree with you if anyone was saying "hey the term open source doesn't mean anything and you can use it for whatever you want" but that's not what I've ever seen happening, and I doubt anyone wants that because it would make the term useless. What we actually do see is other groups trying to promote their own alternate definition of the term and trying to deny the OSI's usage, for equally arbitrary reasons. It's the same form of gatekeeping. Please just come up with another phrase, that's what the OSI did after all when they found the term "free software" to be inadequate.