[0] Fair, reasonable, and non-discriminatory. Each one of those words has a funny legal definition separate from whatever English you're thinking of.
[1] Who, incidentally, sold Apple the modem division that made the C1, because Intel is nothing but a bottomless pit of bad management decisions
As the reply below, Apple still has to pay its SEP. Given Apple has its current deal with Qualcomm until 2027 with time to extend further we likely won't know the full details. Previously it was 5% of Wholesale price for all Qualcomm patents whether they are SEP, wireless or not. With a cap or maximum $20 per smartphone meaning the Pro range don't have to pay a lot more. And rebate towards the modem Apple purchase. The reality after deducting rebate Apple was paying closer to 5%. For reference Ericsson ask for 3% on 5G SEP, previous Cory ruling suggest reality was closer to 2%.
The hard part is designing a good modem while also unambiguously working around all the Qualcomm patents in all the jurisdictions that have iPhone, which is all of them.
Because if you don’t do that, you’re still paying Qualcomm which defeats an important purpose of making your own modem.