At most, TSMC will let Nvidia pay up front to build an additional Fab dedicated fully or partially to their use.
The way Apple already does:
> The investment includes “a multibillion-dollar commitment from Apple to produce advanced silicon in TSMC’s Fab 21 facility in Arizona,” according to Apple’s February announcement. The plan is to double Apple’s Advanced Manufacturing Fund from $5 billion to $10 billion, with TSMC Arizona a primary beneficiary.
https://www.aztechcouncil.org/tucson-chipmaker-tsmc-arizona-...
They aren't going to throw away a long term partner for short term gains.
Nvidia already did. They and Apple were the two primary investors in TSMC's Arizona plant.
Kissing ass gets you in the door with TSMC, but it doesn't protect you from other people outbidding the product you want.