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In some DRM architectures, the key and data encrypted using it is never even exposed to the kernel.

That’s how many high resolution video DRM schemes work.

It lets you detect if the user is running a vulnerable kernel.

Apple's stack is pretty secure. When was the last iPhone jailbreak? I don't follow it closely as I'm not an iPhone user, but it feels like a long time ago now. And if an exploit is found, they can just revoke that kernel version. Apps can then ask users to apply the update to regain access to their streams.

It gets harder and takes longer to jailbreak the iPhone. iOS 15.0 – 15.4.1 was jailbroken - it has been 2 years - I would expect an exploit on 16 already existing and under embargo.

exploits are just kept private by bad actors nowadays.

Apple now gets the worst of both worlds, the harmless jailbreaking scene is dying but the bad actors are still in full force.

How is that the worst of both worlds? The harmless jailbreak world also empowers bad actors.

I never beleived that PR argument

Exactly!