It's only a paradox if you keep thinking from the Client-perspective.

From the Relay-perspective, different communities are different relays.

You can call it the "Client that ignores Relays" Paradox if you like.

But NosTR solved for this from the start.

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That's not solved at all. Every key only has a few specific relay lists. There is no such thing as multiple relay lists for the same event kind.