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Its quite simple.
Nintendo is a major publisher and so is EA, Activision, etc.
EA, Activision, Ubisoft are all competiting against each and Nintendo 
to becoming the dominant publisher.   But since Nintendo has its own platform, the other publishers are at a
disadvantage on a Nintendo platform.   Why support your competitor?  Sony and MS are also publishers, but their 
platforms are mainly designed to be supported by third parties.  Major third parties on Sony and MS consoles
are like first or second parties who get funded by Sony and MS with exclusivity deals.