...But there is always at least one hacker.
The issue with hardening DRM is that at the core it's hard to protect against an adversary that with physical access to the device that keeps the very secret. From the vendor perspective, the very customer paying you is your potential enemy.
That means that the root of trust isn't itself protected with cryptography. Instead, it relies on security-through-obscurity, Faraday cages, fuses, anti-tampering and lots of glue. And it's a numbers game if there are thousands of different devices, potentially with different flaws while your adversaries are hidden among billions of customers.
There is still a gap between the hacker and main-stream availability, though: laws and legalism, like DMCA that penalize disclosing how the obfuscation and all work.