The person you responded to said that a majority preferring one option out of many was not monopolistic behaviour.

Here's that person's comment again:

I didn’t realize that people choosing 1 option out of several is what defined a monopoly. I’m pretty sure it’s when there is no other choice but to use that 1 thing.

First of all, your paraphrasing doesn't make sense because it sounds like you're saying consumers can engage in monopolistic behavior via their shopping choices. I'll assume you were just being lazy with the wording, and interpret it as you agreeing with the statement that "a monopoly is when consumers only have one choice".

I explained in my comment above that this is not true, and I even linked to a Wikipedia article written by people who know more about this than you or I. If you haven't read it, please do. It's not even that long. The sidebar has links to relevant topics that go into more detail about competition law, which I highly recommend exploring.

You're choosing to remain ignorant. I want to know, what's in it for you? What do you gain from doing this? It can't just be the dopamine from seeing number go up, because that has to get old after a while.

My motivation in threads like these is to help share the limited knowledge I have with other people, because the world works better when people know how it works. I'm not a lawyer, but I'm an antitrust nerd as it's a pretty massive issue in the industry where I work (tech), and my experience is that there are a ton of people like you two with an incorrect understanding of how the law actually works. This is counter productive to solving the antitrust issue because misinformed people end up voting for the wrong things (and/or influencing policy in other ways).