But they haven't crushed any other competitor through any mechanism but having a dramatically better product.
They don't force you to be exclusive to be on steam. They don't force you to implement any of their Steam stuff. They are very permissive unless you do shit that potentially exposes them to liability down the road, like the NFT nonsense.
And they let you generate keys for literally free to sell on other stores.
All their stuff companies use is because it's things customers value.