Asked ChatGPT for edification and it says this:

"Yes, there are TLDs that also operate as domain registrars for their own TLDs. These are known as "Registry-Registrar" models, where the entity that operates the TLD also offers domain registration services directly to customers. This allows them to have more control over the registration process and potentially offer unique features or services.

For example, the ".xyz" TLD operates its own registrar service through a company called "XYZ.COM LLC." Similarly, ".app" is operated by Google and also has its own registrar service.

Keep in mind that the availability of such models can change over time as new TLDs are introduced and existing ones evolve. It's always a good idea to verify the current state of affairs with the specific TLD registry or a domain industry resource."

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Discussion

If the only thing that the .npub TLD registry registrar server did was try to open nostr apps, we could create some sort of request in the protocol that clients could honor. If that's the only thing that the server did — request the clients to open that particular npub, can't see how the system could be abused.