This is a very simplistic view. IPv6 doesn't meaningfully improve or hinder your anonymity compared to IPv4 behind NAT. Facebook, Google will in the common case

This is a very simplistic view. IPv6 doesn't meaningfully improve or hinder your anonymity compared to IPv4 behind NAT. Facebook, Google will in the common case obtain way better fingerprint by using many techniques together. Your ISP has a contract with your address on it and is usually required by law to keep records. It will know what happens independent of IPv4 or IPv6 - you will still get the blame and privacy extensions have a similar effect here like NAT. If everybody was just a consumer all the time, we would have a very different (worse) society overall. There is a reason a subset of technical people do want IPv6 even if it means way more work for them.