> How? Phones are already locked down pretty hard

But never well enough, it seems.

If you can't revoke the token then I'll just sell mine to whomever needs it.

Kids will beg/borrow/steal their parents / older siblings ... etc.

The "harden the device, bake in controls that are difficult to circumvent and managed by not-the-primary-device-user" approach is _very_ similar to DRM. All that does is punish the innocent.

I have never once had VLC tell me that the mkv file I just opened can't be played because I'm not in the right region or because my screen is too old to support encryption. I have had family learn the hard way that DRM is not in their best interest, though. Now they just ask me for the movie on a pen drive when I visit next :).