griff on Nostr: That's the federated part of the fediverse. Other people can choose to interact with ...

That's the federated part of the fediverse. Other people can choose to interact with it on whatever instance/platform they want. You can block that instance so that interactions that happen on that server don't reach yours, but as long as you (or firefish.city) is federating content, anyone can pick it up, even if it's not directly from your server.