If EGS mandated those things it would be as successful as GOG. Which is irrelevant compared to Steam. Steam didn't become successful because of tags. It's because they were first.
You don't seem to understand what a monopoly is. Having some small competition that's not ever going to threaten you because you can leverage your dominant position is also a case of a monopoly.
Epic poured billions of Fortnite money with little to show for it. How is anyone going to compete with a platform that most gamers have all of their games on? This is why they need to be broken up or brought to order via regulations. Companies are not your friends.
I'm accelerating late stage capitalism by being critical of monopolies? What???