locality is good for resilience and latency but for privacy? how does it work? How can one audit that the bytes going from a DC in country A to a DC in the US

locality is good for resilience and latency but for privacy? how does it work? How can one audit that the bytes going from a DC in country A to a DC in the US is not the user queries but some telemetry data for example? Presumably you don't get to look at the unencrypted packets