Intel is 10 times larger than AMD.

AMD can't ramp up the manufacturing volume it has from TSMC up quickly. TSMC builds capacity to match roughly what it is contracted for. I can just assume that any extra capacity they planned sells for a very good price.

Neither AMD nor TSMC can fully exploit Intel troubles because they can't foresee what happens in Intel manufacturing. Intel is selling chips like hotcakes.

TL;DR Intel has high manufacturing volume and the ability to make money with less competitive product.