It's not stupid of AMD not to start a turf war where both they and they patron saint are hurt.
They get to eat the scraps and have the occasional win so that nvidia and intel don't face impotent mealymouthed anti-trust procedures.
You can either come up with a better alternative explanation, I can lawyer up a perfectly cromulent explanation that doesn't require exposing the corrupt underbelly of the silicon industry, or you can think that everyone at AMD is an idiots snatching defeat from the jaws of victory.