before (what? when? covid?) nvidia annual revenues were circa us$10b and amd was competing with it to make GPUs. after (what? when? covid?)..or now.. nvidia is a accelerator manufacturer with a small legacy GPU business and revenues are closer to us$200b. and amd is still no closer to competing with nvidia at making GPUs. intel started something in the mean time though. but everyone seems to be expecting them to try compete with nvidia at making accelerators. nobody is interested in GPUs anymore. accelerators seem to be the much bigger and more interesting market.
They aren't. Graphics cards aren't as efficient as making a card dedicated for training models. You won't be able to take cards from a datacenter and put it in your PC for gaming.