Compounding the issue, maybe not for Google's devices but certainly others', is locking the bootloader so you can't even install an aftermarket ROM derived from

Compounding the issue, maybe not for Google's devices but certainly others', is locking the bootloader so you can't even install an aftermarket ROM derived from open-source projects that are up to date security-wise. I won't name names, but one particularly egregious offender's initials are VZW.