Oh and here I thought you had decided you didn’t want to embarrass yourself when you deleted your first post. They’ve clearly chosen to not pursue the option of being a monopoly by the simple notion that they allow other businesses to sell their keys. They are not a monopoly, has never been one and by every notion has made no moves towards becoming one. Otherwise 3rd party stores would not be able to sell steam keys it’s really very simple, you’re able to buy steam keys where none of the money goes to valve.
What actions in response to epic are you talking about? Steam has done damn near nothing. Epic demanded steam cut their share down to the same as epic, steam didn’t respond. Epic kept pulling exclusives OUT of the steam store, steam did nothing, didn’t try to pay devs to make games steam exclusive. Hell steam even probably had decent grounds for suing both epic and some devs for breach of contract and potentially interfering with contracts but they have not. Steam has just kept on trucking as usual, though it’s possibly I’ve missed something they’ve done in this regard so feel free to make some sort of specific claims.