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EU fines Apple $568m for deterring third-party payment methods on App Store
(www.gamesindustry.biz)
This is a most excellent place for technology news and articles.
Big difference here is that Windows doesn't REQUIRE developers to use the windows store or still pay them money if they use other methods of payment. Anyone can download an installer and install software without the Windows store and Microsoft doesn't make developers pay them still to do that.
Now if they could get away with it they absolutely would like on Xbox. That's why Valve put so much effort into Linux.