See Intel & AMD are hardware companieswell, that's how it is, they have knowledge, maybe patents and so on
Nvidia is a software company (cuda / dlss / raytracing denoiser etc.) that is vertically integrated like apple
I believe Nvidia was the first with programmable/unified shaders & outsourcing to Taiwanese foundries/TSMC
So AMD & Intel would like to be in Nvdia's shoes but they have not done the work to get there. Basically Jensen Huang not only had a strategic vision but executed very well on it. It is rare that you have a founder so good at executing on strategies (again Apple comes to mind)