The castle is the (paid) relay
Discussion
You literally sign the notes you're attaching ecash to. And you're doing it every time. They can discard your notes and just keep the ecash.
Vs just paying once, actually anonymously, for a npub that may not even be yours to whitelist it in a relay.
C’est la way.
A castle as a relay is fine, but a paid one? Now that’s feudal capitalism