If you think that would destroy nvidia you're selling them quite short. Other companies in the market are following that exact business model: Don't produce your own boards, actually document the hardware / have FLOSS drivers.
Nvidia not producing their own boards wouldn't solve anything but complicate matters for Nvidia. Ask Asus or EVGA what their margins are on their Nvidia GPUs. Nvidia opening their stack to the competition was the only half realistic suggestion.
but you come here and throw national interest into the mix.
Why do you think the whole 4090 D debacle happened? The US government have obvious interests in limiting the compute power China has access too. Nobody cares about their gaming GPUs, it's the ML chips that are making the waves, and those are of obvious national interest to the US government.
How the fuck would nvidia losing market share to AMD damage US national interest it would strengthen its standing by having independent options.
Brush that chip off your shoulder, not sure what's making you so angry. And why are you bringing AMD into the picture, they aren't even the biggest threat to Nvidia's ML hegemony. I was also specifically referring to how dismantling Nvidia would be counter productive to US interests, not Nvidia's market share.
It might even enable Intel to secure their foot into the market, remember, the only one among RGB to actually produce their own chips. In the US.
Neither AMD nor Nvidia are into the foundry business so I don't see how that's relevant. Intel is decoupling their foundry so nothing is stopping either companies from porting their chips if need be.