I did a cursory glance at Nvidia's and AMD's respective careers pages for software developers at one point - what struck me was they both have similarly high requirements for engineers in fields like GPU compute and AI but Nvidia hires much more widely, geographically speaking, than AMD.

As a total outsider it seems to me that maybe one of AMD's big problems is they just aren't set up to take advantage of the global talent pool in the same way Nvidia is.