[fguerraz]

Facebook would start listening on port X and and then their embedded SDK in other websites or app would query that IP and port, get their unique id, and track users much better.

Sounds farfetched? https://www.theregister.com/2025/06/03/meta_pauses_android_t...

[lpribis]

This is local to the device though. Nothing to do with the WAN. Would still work even on the "serverless" ipv6 network.