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Your last point is why I don't really see the hype over RISC-V from an end-user perspective. Companies manufacturing RISC-V processors are free to add whatever private extensions (or backdoors) they want. And unlike software, you can't easily reverse engineer it to discover them.

RISC-V certainly doesn’t prevent this kind of thing but it does at least provide the opportunity for this kind of behavior to be challenged. Given anyone is free to manufacture a RISC-V processor it’s at least feasible another company could step in and provide a product that doesn’t do these things if that’s what the market demands.

ARM is OSS?

ARM is commercial, but yes, there is nothing that stops Apple from modifying the base ARM spec (and afaik they already have).