[citation][nom]A Bad Day[/nom]Why support your competitors?[/citation]
It's not about supporting it, it's about being jackasses about the tech. When they approached AMD for "licensing", I'm pretty sure Jen didn't want a "fair" deal with AMD, so AMD blew them away and went with OSS alternatives (at the time).
If you notice, nVidia is in a position where they could contribute a lot to Bullet, but they don't. They could make PhysX OSS, but they won't. They could move from CUDA to OCL, but they won't.
They're desperately trying to push down consumers throats 3D, CUDA and PhysX, where among those 3, CUDA is the least useless tech they provide (actually, it is very good).
TL;DR: No, it's about them being assholes with the tech.
Cheers!