That tells me you don't understand what they offer or the value of it.

And if you think hosting a CDN across the world is cheap, you have a surprise coming. Ignoring the fact Steam has a large audience and hosting your own game would bring in a lot less revenue than you would through Steam (even with the 30% cut), it's a lot of work to host and market a game online. If there's updates, you have to alert people the game has been updated and direct them to download it again.

Valve Index was successful, Steam link was great, Steam Deck is great, the Steam controller was good in it's own right and it's trackpads are now one of the best features of the Deck. They can experiment with hardware because of the profits, they can afford for them to "flop". Now Linux gaming is a lot better because of Proton too.

Not that I agree with the 30% cut in it's entirety, I think they could subsidise more for small independent developers.