An a full-time indie game developer what I find fascinating is that Steam do the opposite of this. The more you make, the less you pay Steam, but the thresholds are in the millions. If you make more than $50 million then Steam take 20% not 30%. I understand the reasoning; Steam want to keep some of the big publishers like Rockstar Games, PUBG Corp and EA happy and not so tempted to move to their own platform (or to Epic).
But if you're a developer who isn't making more than $50 million (like me!) you end up paying more than the enormous corporations. Unless you're on the App Store, where it's the opposite. It's funny how the focus is different here.
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