RATE LIMIT is already used by many - they are SAFE from exit IP or npub changes that simple to mitigate n slow them down to non-abuse levels (this is nothing to do with content). any attackers can break any filter over time once they learn it.
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less than a millisecond for a new npub, less than a second to auth with it, resume spam
paid subscriptions can still be attacked trying to break the security but they can't upload data the server is dropping automatically and ceasing to respond to it
there are many countermeasures, please, you, and quentin, study some network security theory
google and yahoo and protonmail and cloudflare deal with this bullshit every day, and you don't know it until someone finds a crack and jams a wedge in it