>>lugu+(OP)
Apple & Nvidia switching to, say, Samsung as their foundry would likely take at least a year before they'd start to see production. Meanwhile, little to no revenue. It is a risk for them. And if China went for Taiwan, why not also cause some trouble for S Korea while they're at it? (Wouldn't have to invade, just block shipping, etc. - if China decided to do maximal damage. It's also quite possible that N Korea would take advantage of the situation)