TSMC isn't running a charity, it sells capacity to the highest bidder.
Of course customers as big as Apple will have a relationship and insane volumes that they will be guaranteed important quotes regardless.
If it takes 4 years to build a new fab and Apple is willing to commit to paying pay the price of an entire fab, for chips to be delivered in 4 years time - why not take the order and build the capacity?
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But Nvidia has also spent billions/year in TSMC for more than a decade and this just keeps increasing.
TSMC isn't running a charity, it sells capacity to the highest bidder.
Of course customers as big as Apple will have a relationship and insane volumes that they will be guaranteed important quotes regardless.