Npubs take space. 5000 users with average 2000 follows would use well over 650 MB of bandwidth in just a few minutes. Some clients are inefficient and same the same queries over and over. A relay handles terabytes of data per day.

Without limits some script kiddie will start abusing things.

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Right. Hadn't thought of the bandwidth component, only the storage one.

Maybe relays charge a few millisats per linked npub, from a budget paid for in advance. End users are charged similarly for each post they read.