Issues with grub menu
Issues with grub menu
It's not even a case of "setting up", if it doesn't exist there is no user to run the init, kernel, etc. It might be possible on an embedded system to have the appearance of "no user", but it is still there (without some serious kernel hacking). If anyone uninitiated takes a look at /etc/passwd I think they'll be surprised by the number of system users that exist to create user and group "file security domains".
Guest is typically treated as a visitor rather than a permanent user. Many modern smart TVs, including Bravia models, operate using Android, which means they can be updated and managed through software rather than direct kernel modifications. This approach makes it feasible and common for such devices to function without permanent hacking.
You can switch to developer settings to view RAM usage and services. You'll see apps and system utilities you rarely encounter, most of the time. This approach varies across brands—some offer extra security features. If you understand your own system, you might be able to isolate it or modify settings locally. However, this is only practical on a limited scale. Unless you're in a critical role or your hardware is at risk, it's generally not a major concern. Disk encryption could help prevent data loss if your device is stolen. The issue often arises during the OS installation process.