So let me get this straight:
You've previously had paragraphs long posts with someone because they were using the dictionary definition of "monopoly" instead of the legal definition, and then instead of clarifying what definition you are using you let yourself walk into the exact same situation and you accuse other people of not learning?
The dictionary definition of "monopoly" is not wrong, it's in the fucking dictionary. The legal definition is not wrong either, it all depends what you are talking about. Considering the original post wasn't about the legality of the situation at all, there's no reason for someone to assume the legal definition over the dictionary definition.
Then, when someone acknowledges that your definition is also correct you mock them for agreeing with you, then you're surprised when you have difficulty getting people to agree with you.
So it looks like you have no interest in having a meaningful conversation about the topic, and instead just go on and on about a pedantic point that is a distinction without a difference.