Closed as not planned
Description
Especially for NSFW instances there's a strong use case in which an admin will want to federate with a remote nsfw instance but not have its posts show up in public timelines.
Users from the nsfw instance would still be allowed to post and send messages to the sfw instance without a problem. It's just that the content itself would not be visible unless a user is explicitly subscribed to a community from that nsfw instance.