Isn't it funny and crazy?
Nvidia is trying to leverage TSMC, Samsung, and Intel against each other in order to get the best deal. But there are two limitations:
1. Walmart uses this strategy all the time to get cheapest products. But semiconductor products are much more complicated and take lengthy cooperation between foundries and fabless companies. TSMC positions themselves as everyone's foundry but it doesn't mean everyone can get into the production schedule in the same time. Relationship, trust, and long term commitment (both ways) are critical.
2. If a fabless company (such as Nvidia) tries to maintain significant order quantity at Samsung and Intel at the same time, it may make Nvidia an insignificant customer at TSMC. On the other hand, TSMC can give preference to AMD, Intel, and many other companies who have products compete against Nvidia. It's a tricky situation.