Quest is not a screen. It's a computer with a built-in screen. iMac for your face. Quest with a link cable is still not a screen, but a computer running a kind of "remote desktop" software.
The computer part needs an account. Virtually all software for it is paid, and it is genuinely helpful for non-technical users to have a "cloud" account that ensures they won't lose their games even if they sell or break the device.
