I seriously doubt that's true. I'm sure I'm not convincing any of the people debating me in their own comments, but there are always other people reading the debate, who don't have as strong of preconceptions as the people commenting, and I suspect at least a few such people have thought to themselves "hmmm, yeah, he's right, those don't seem like monopolies". (I'm sure there are people being convinced of the opposite too.) It's a mistake to think the audience for a public discussion is limited to the people commenting.

Edit to add: And to the "everyone knows what is meant". No, that's not true, lots of people have become confused by the usage of the word "monopoly" to describe the issues with big tech companies, through its pervasive usage in congressional hearings and media. Using confusing inaccurate language is not harmless, it confuses the debate.