Adding users to trusted-users is a bad idea, as they can modify things like substituters.
https://nix.dev/manual/nix/2.32/command-ref/conf-file.html#conf-trusted-users
Warning
Adding a user to
trusted-usersis essentially equivalent to giving that user root access to the system. For example, the user can access or replace store path contents that are critical for system security.
Use allowed-users instead.