AMD funded a drop-in CUDA implementation built on ROCm: It's now open-source

Cannot understand why AMD would stop funding this. It seems like this should have a whole team allocated to it.

They would always be at the mercy of NVIDIA's API. Without knowing the inner workings, perhaps a major concern with this approach is the need to implement on NVIDIA's schedule instead of AMD's which is a very reactive stance.

This approach actually would make sense if AMD felt, like most of us perhaps, that the NVIDIA ecosystem is too entrenched, but perhaps they made the decision recently to discontinue funding because they (now?) feel otherwise.