I think you will find the licensing cost for big platform will be huge, + the manufactures approve the games them selfs, and can (and have) not allowed games to be release because they are not good enough.
If you look at sega vs accolade, accolade won because they backwards engineered the megadrive and did not use the SDK. But being legally right is not always good enough eg. Sony sued Bleem out of business even thought sony never won in court.
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