How does this scale? TSMC can't literally be the only fab in the world...
Samsung comes in a close second in terms of tech. GloFo is also still floating around though lagging pretty bad AFAIK. Micron has it's own fabs that they are actively developing (in fact, they are building new facilities right now).
What TSMC is is cutting edge. That's why everyone that needs top performance uses them.
In this case...TSMC is holding all the cards, not Nvidia