I’m not entirely sure how to ask this, but is there some way for a Mastodon server to host only its own content while being accessible to others?

If I understood the basics of Mastodon correctly, one Mastodon server will automatically download content from another if they are federated.

That obviously leaves the potential of downloading illegal content from a rogue or unmanaged server, which may be a liability for server owners. Of course - you can defederate but I imagine that certain entities that focus on publishing information would rather not have to deal with constant moderation.

Thus, would it be possible for a server to never download from any other server (federated or not) but have its content available to any servers that federate with it? Does a feature like this exist?