Out of the technical zone, could not Nvidia, if holder of ARM, decide to review all contracts Apple has signed with ARM Holdings for licenses to ban the use of some basic extensions, ISA, claim royalties, etc?As far as I know, that’s all true. My best bet is that Apple can essentially do whatever it wants. It might not be allowed to call its products “Arm” if it doesn’t get ”concessions” when it makes certain types of modifications. But notice that Apple really doesn’t mention Arm in any of its marketing. It’s just “Apple Silicon.”
All of which goes to show you that if Arm went away, Apple would be perfectly capable of going it alone and moving its chip architectures forward, but for now, for the sake of keeping the benefit of industry-wide Arm tooling and resources, they play nice.
Of course we don't the have the contract to see and read but on general terms how would the perpetual license work.