restrict outgoing connections (privacy, data protection, outbound traffic)

For privacy, data protection and security reasons it can be helpful to strictly control outgoing connections.

I suggest a setting to disable outgoing connections.

Some granularity for the setting may be helpful too. So for example updates can still be received but other outgoing connections can be disabled.

Alternatively an overview of remote addresses would be helpful. So a firewall can be used to restrict connections to them.
I could not find such a list, except for this forum thread from 2018:

Which URLs+IPs needed for outbound traffic from Nextcloud-server?
https://help.nextcloud.com/t/which-urls-ips-needed-for-outbound-traffic-from-nextcloud-server/27637

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The issue names no files, tests, or entry points. First clarify whether the goal is an outbound-connection control setting, granular exceptions, or a documented list of remote addresses; done requires an agreed scope and acceptance criteria before implementation.