But nvidia can sell to anyone, right?

They'll take a heavy hit stock wise, and might be an LLM company through all their shady financial constructions to keep the music going by propping up demand. But in the end, nvidia as a company has a place even when the frontier labs go bankrupt. Some other company will take their place. Worst case it'll be like the cable companies in the end 90s who found themselves out of work because they overbuilt for dotcom