Or the electricity. Or the supply chain. Or the engineers. Or the factory workers...
Intel has undertulized fabs. Under capacity means there is some electricity from the other part of campus not using as much. There was already flow of basic supply chains materials to the existing site and. have factory workers who need more shifts filled.
Can Intel do the entire scope of Apple production? No. But neither can Apple move all of it there quickly either. A17,A18,A19 prodution isn't going to move to Intel even if Intel had fully equipped factories ready to go. Legacy silicon isn't going to be redesigned to get onto a new process at deep discounted prices.