Scoundrel on Nostr: I don't think there is any need to actually retrieve notes for the user, especially ...

I don't think there is any need to actually retrieve notes for the user, especially for relays that are more picky than you. If a relay owner hates a user or their content, then making that relay store or retrieve notes from that user doesn't seem right to me. If I was defining a standard for relay filter transparency, it would only ask that a relay store the ID of the excluded post, the reason for excluding the post, and the relay that the post was obtained from.

When I talk about developers implementing something like your API, I'm not talking about the user being able to copy your filters, I'm talking about users having the ability to more easily audit relays without ever having to leave their client.