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Valve ban advertising-based business models on Steam, no forced adverts like in mobile games
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Everyone is acting like this is purely for good intentions, but I'll point out they make most of their money from taking a cut of the sale price from games. Ad money probably would not go to them at all. This is almost certainly purely a business decision, not because they fundamentally don't like the concept or want to protect you from it.
Also known as free market capitalism 100% working as it should.