Update 66.md with defensive measures (#2240)

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@@ -95,3 +95,9 @@ Example:
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 ```
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+ ## Risk Mitigation                                                                                                                                                 
+                                                                                                                                                                   
+  - Clients MUST NOT require `30166` events to function. Absence of monitoring data MUST NOT prevent relay connections.
+  - A monitor may publish erroneous `30166` events, either by misconfiguration or malicious intent.
+  - Clients SHOULD NOT trust a single source. Defenses include: web-of-trust filtering, querying multiple monitors, and discarding filter results if they would remove an unreasonable proportion of relays.