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They build the OS and SDK on Mac too, why do they not get a % cut on all apps there too?Because they chose not to for business/historical reasons. So?
>Actually when you're in Safari you're using their OS and SDK too why don't they get a % cut of purchases and software there too?
Well, technically you're not using their SDK. Just the OS and the browser engine. The SDK is just the JS runtime.
That said, they could. And people could use another platform.
>Just interested why one scenario is considered the norm yet these two others that fall under the same justification seem absurd.
In the end it's a business decision, with historical (e.g. computers didn't have this model in the past, phones/consoles/etc did), market, and other considerations.