Earlier quoted context omitted.
There is no moat in models (OpenAI). There is a moat in infra (hyperscalers, Azure, CoreWeave). There is a moat in compute platform (Nvidia, Cuda). Maybe there's a moat with good execution and product, but it isn't showing yet. We haven't seen real break out successes. (I don't think you can call ChatGPT a product. It has zero switching cost.)
What moat does Nvidia have. AMD could have ROCm perfected if they really want to. Also most of pytorch, specially those relevant to transformers runs perfectly on Apple Silicon and TPUs and probably other hardware as well. If anyone has moat related to Gen AI, I would say it is the data(Google, Meta).
It's not an act of will or CEO dictat. It's about hiring and incentivising the right people, putting the right structures in place etc all in the face of competing demands.
Nvidia have a huge head start and by the time AMD have 'caught up' Nvidia with it's greater resources will have moved further ahead.