Admin setting to disable anonymous profile URLs

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Is your feature request related to a problem? Please describe.

The profile pages on /u/ are publicly available, see https://github.com/nextcloud/server/issues/32086 . Users are currently able to specify per field who may see it. This is error prone for me because I have a Nextcloud that shouldn't be visible to the outside.

Describe the solution you'd like

Add an admin setting to be able to disable anonymous access to the profile pages. Thus only logged in users (and guests) are allowed to see profiles.

Describe alternatives you've considered

Current workaround is completely disabling the profiles in the server config. But then, my users can't view each others profile.

Additional context

Start with the existing /u/ profile pages and the current server-config workaround that disables profiles. Trace how anonymous access and admin settings are handled; done means an administrator can disable anonymous profile access while logged-in users and guests can still view profiles.