It already has been in a sense, as the underlying technology for SEV was developed by AMD to protect the DRM running on game consoles.

That being said, AMD SEV is transparent to the underlying applications and users, so anyone with an interest in protecting memory from certain classes of attacks (e.g., Meltdown, Rowhammer) can benefit.

Other technology in this space (e.g., Intel SGX, Arm TrustZone) requires the application to explicitly support the secure enclave, so their usefulness to a typical end-user is much more limited, and as such, they aren't really used much other than to enable DRM.