i don't think so.. nvidia pay for using physX---
developers just use what brings the most cash..
"Nobody is blocking them from doing so."
i think nvidia is blocking.
and they pay for max damange on other companys.
"Nvidia also contributes to openCL and probably has the best implementation of it out there along with some of the best documentation."
documentation? can you give me the spec of a gtx480 ?
"They are not forcing anybody to use Cuda or Physx,"
they Pay this is a kind of force the force of the Profit and money-
"that is the choice of the developer."
the choice? i don't think so no other company pays for bullshit like nivida.
this choice just hurts entusers and force them to buy nvidia hardware.