If the maintainer is anonymous, that might help. With Nostr there is no web host to speak of that can be punished, the data just lives on relays. It depends on if the interface needs a server to host. Can it be an app, or entirely hosted on Nostr somehow?
Discussion
Aren't relays located somewhere? I imagine going after UK-based relays. Good luck with going after others though. It's an interesting development and let's see if "Nostr" can capitalise on it