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> Real shame since cortex has a admin TrustZone processor that is licensed to special interests only.

This is substantially inaccurate.

1) Not all ARM Cortex series CPUs have TrustZone. It is absent on many Cortex-M microcontrollers, for example.

2) TrustZone is an operating mode of the CPU, not an "admin processor". Depending on the part, it is often made accessible to developers. (Whether that includes third-party software developers is, of course, up to the device manufacturer.)

For more information, see:

https://developer.arm.com/documentation/100690/0200/ARM-Trus...

There’s a discussion to be had on the absolutism of technology for decisions or security, and the slow erosion of a certain intangible “discretionary” element in day-to-day life.

Any secure boot design can achieve that, you don't need TrustZone to do that

What prevents a motivated cheater from swapping out the processor entirely?

The effort.

And the cost, and the parents.