All this to try to win Apple's SoC?
Oh, and all fabs require any IP as intricate as a memory or standard cell library to go through their verification process, as cell characterization is crucial to getting good yield (and not interfering with any other designs in the case of multi project wafers).
[0] https://www.arm.com/products/buying-guide/licensing/processo... [1] https://www.altera.com/products/fpga/stratix-series/stratix-...
Probably the only way they can be sure of that is to have a contractual relationship of their own with both parties.