About the System Publisher account
When you first log in to your portal, you'll notice there's already an account called System Publisher (system_publisher). When your portal is configured with a hosting server, the System Publisher account is used to geocode CSV files in the map viewer on behalf of portal users who do not have publisher privileges. For example, if an anonymous user or member in the user role drags and drops a CSV into the map viewer, the geocoding of locations is performed by the System Publisher account on behalf of the user.
If your portal is not configured with a hosting server, the System Publisher account is not used. Instead, any geocoding is performed by the geocoding service you have configured for your portal. If credentials are required to use the geocoding service, users invoking a geocode must enter their credentials in the map viewer.
If you want to disable anonymous users or members in the user role from geocoding items in the map viewer, you can delete this account. Once the account is deleted, only members in the publisher or administrator roles will have privileges to geocode items in the map viewer and publish services. Once the account is deleted, it cannot be recovered. See Removing members for full instructions on deleting the account.
The System Publisher account does not count as one of the named users in your organization. Any other account that you create or add to the portal will count as a named user.