Apple never made legally-binding commitments to price their products/services in particular ways; Qualcomm did.
Nor does voluntarily contributing patents to be FRAND under ETSI rules bind any particular rate method, beyond the requirement that the same rate structures be available to all.
In fact, the ETSI FRAND contract, which most people talking about FRAND have never bothered to read, says nothing about pricing and even states that requiring cross-licensing is okay:
The point of my post was that billing by product price is considered neither an uncommon nor unreasonable method. Being FRAND does not mean that billing method becomes unavailable. As the ITC noted against Apple when it banned iPhones, at another time that Apple claimed such pricing was unusual:
Even the Chinese government, who famously does pretty much whatever it wishes, has recently ruled that phonemakers must pay Qualcomm by percentage of device price.
Too many people mistakenly think that the issues that other companies and governments have, are all about pricing by device cost. Instead, the actual thrust is about changing
other Qualcomm actions, such as not giving a pricing break for the value of cross licensed patents, and requiring purchase of their entire patent license even if only part is needed. (Although such was not uncommon in ETSI as well.)