IIRC from the suit, Intel never spelled it outright that you couldn't buy AMD, they just provided sales targets required for discounts/marketing partnerships (which just paid money to the retailer for hanging up Intel advertising) with different purchase amounts for different retailers, and if the retailer started selling AMD, they'd hike up the amount until they were no longer selling AMD.
But aren't exclusivity contracts commonplace? Like a contract stating "We'll buy some large amount of product at a discounted price and only purchase from you for the next some number of years." Like Qualcomm could give Apple a lower price now, because decrease in revenue is offset by the promise of future discounted revenue. I don't understand why that's illegal.
"Buy five thousand and I'll give you 10% off"
"Buy five thousand and don't buy from my rivals and I'll give you 10% off"