[farfatched]

My OS gives me IPv6 privacy addresses out-the-box which rotate every few hours.

[throwawaypath]

The prefix is your globally unique identifier. "Privacy addresses" provide zero privacy.

[ButlerianJihad]

“Privacy addresses” are named because in the beginning, your auto-generated IPv6 would incorporate your hardware MAC address verbatim, and many people consider the MAC address to be PII.

[throwawaypath]

Hard to believe the committee thought that was a good idea.