Yeah, these guys, hyper free-market capitalists that they are, don’t seem to understand that the answer to “What if they just started banning everyone?” is, “Well, then they’d be out of business, and someone else would start a new company to capture that marketshare.” It’s like they think capitalism doesn’t actually work or something.
Of course, their attempt to do that with Parler just blew up in their faces due to their own incompetence and evil, but you know, someone with brains could do this.
I don’t think there’s a specific term for this. I actually deal with this in my real-life job. In my work, an applicant is permitted to define what they mean by a given term, if there’s some ambiguity as to how it can be used*, but they’re not allowed to just write whole new definitions for commonly used words. But when making an objection, I pretty much have to spell it all out like that, because I don’t have a word for it.
*Like if they said “In this application, “computer” is meant to be an IBM-PC type computer”, which then excludes anything like an Apple computer. They can narrow the definition, but not just say, “By “computer”, I mean a potato with a wire stuck in it.”