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It doesn't matter because neither of them will use it, NVidia would probably make Physx open for the positive PR it brings if they knew that AMD would completely ignore it.
It's simple marketing, create a product, give it away until it becomes industry standard and then charge for it. Intel and Nvidia won't touch it with a barge pole simply because they weren't born yesterday.
Hmmmm
Name other software that applies to? Because I literally cannot think of anything.
.
Nvidia guys on here kept banging on about how it wouldn't happen because....... no reason, ignoring history of it
There you have it!
DirectX 12 come from Mantle, Microsoft learned from Mantle to bring us DX12
http://youtu.be/C_3OAD-Dhs0?t=18m32s
PR guff, mantle came from DX just as much or more so than DX12 came from mantle