Are you somehow implying that everyone in the AI arms race believes that only CUDA exists?! /s

But, in a more serious tone: the story that I hear about AMD GPUs is that they are, in fact, shittier because AMD themselves give fewer shits. GIGO

What is this comment saying? You think the results are different just because of AMD hardware? If there is a difference it would be a software bug.

Everyone in the space only caring about (and therefore testing on) Nvidia/CUDA as suggested in GP is exactly why a software bug that seriously impacts results but only effects AMD GPUs would get through into released software very easily.

That would be a webgpu bug or an AMD bug, not a bug in this software.