you seem unable to properly understand that a lack of a reply can mean different things, and you just assume that the person not replying to you agrees with you and is just too afraid to say so.

If you say “the earth is flat”, then someone replies with evidence of how the earth is not flat, then in another thread, you say again, “the earth is flat” without ever replying to the evidence, that is dishonest. If contrary evidence won’t get you to change your tune, what is the point in talking to you?

Steam does not have a monopoly on gaming. If you want to narrow that down to PC gaming then you’re changing the subject, You were the one who insisted this conversation be about gaming in general. The person you replied to did not specify the market, and was clear the moment the discrepancy arose what I and everyone else was talking about.

but even then, they do not have a monopoly on PC gaming because they are not the only sellers.

You have already been shown that monopoly does not literally mean “the only seller” but instead means “the dominant seller”. By this point it’s downright weird that you keep insisting this is the meaning without even admitting that the counter-examples in textbook usage exist.