Words don't matter. Do well and have a platform that most prefer? You're a monopoly. People don't realize that to be a monopoly you must be the only source and actively prevent access to or other sources of the same product. How many of those using the term monopoly regarding Steam have GOG Galaxy, Epic, Battle.net, and etc. installed on their machines, ya think.

Being the best does not a monopoly make!

Edit: Further, and speaking of Epic, I never heard of Steam paying devs to pull their games from other platforms for exclusivity deals.