I run it and monitored the traffic using Wireshark for a while, and there wasn't much really, just some analytics, but just in case I run it over wireguard connected to PiHole, with onyx domains blacklisted. Only when I update device do I whitelist them and block again after I'm done. Additionally network traffic is allowed only over VPN (wireguard) connection. Funny enough, google play services is much worse then Onyx.
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