Actually if you watch the announcement video of prores raw by Atomos, the CEO briefly mentions that Apple has restricted prores raw for the first 6 months. The reason we have access to prores raw on so many cameras right now is because the Atomos Inferno supports it. Apple and Atomos released prores raw together. I know there's been a feature request since the beginning to get support in premiere, and it currently has over 700 votes. Yet Adobe has had no word on an update, and seeing that it's been 5 months...
Well RED Raw is only available on red cameras so.... Blackmagic raw has the potential to be way more widespread