I don’t think I disagree with you, I just think Valve should be the last company that should be under fire for the 30% cut. As in, it should come after plenty of other companies, because they actually do offer many valuable services in return. I’m all for lowering the cut Valve takes, just make sure every other storefront that does objectively less is required to do the same.
It also feels like complaining about the food from one store being expensive, while you get larger potion sizes than other places for the same price. Yes, food should be affordable. Shouldn’t the complaint be made towards the industry as a whole rather than the store that is (for now) objectively better than the alternatives?
I’d say start with Apple’s and Google’s app stores.