One last bit of wondering I have is about this paragraph from Security
Considerations:

"This method can be abused by intentionally deploying broken zones
 with agent domains that are delegated to victims.  This is
 particularly effective when DNS requests that trigger error
 messages are sent through open resolvers [RFC8499] or widely
 distributed network monitoring systems that perform distributed
 queries from around the globe."

Is this a novel risk presented by the proposal?  Any more than, say, a
random subdomain attack targeted directly at the agent domain? 
      

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