As I know some use Google pixel hardware because bootloader can be unlocked and then locked again (for security reason) with custom rom. Read that One+ allow do the same. With other vendors you can only unlock bootloader if vendor allow.
As I know some use Google pixel hardware because bootloader can be unlocked and then locked again (for security reason) with custom rom. Read that One+ allow do the same. With other vendors you can only unlock bootloader if vendor allow.