HIP tries to be like this, almost API compatible with CUDA such that you just need to do find and replace. I think they even had a script to do this for you.

But the issue remains that the actual support and debugging tools remain so atrocious that it doesn't help to combat the CUDA monopoly. They've further burned a lot of trust by never really delivering on their promises to do better unless you're a customer large enough to get personalized attention from their engineers.

This ends up being a double whammy because not only are you pushing away smaller businesses, you're also pushing away single developers that go on to influence purchasing/development decisions.