http://o54hon2e2vj6c7m3aqqu6uyece65by3vgoxxhlqlsvkmacw6a7m7kiad.onion/en/blog/2022/4/25/apples-private-relay-can-cause-the-system-to-ignore-firewall-rules
See Apple’s instructions . It is hard to speculate about the severity of this leak since the traffic is encrypted, meaning we cannot really know what it contains. This does however signal to your local network and ISP that you are using a macOS device.