Perhaps this is the difference, some people are concerned with being anonymous from companies like google, amazon, etc. Some don't mind that, as long as they are anonymous from a government.
Your mention of subpoena suggests you don't care about google tracking you.
I was directly replying to someone saying they could subpoena the temporal owner of an IPv6 address, as though that were somehow different than IPv4.
The tracking is a moot point. You can be tracked using the same technologies whether you connect though v4 or v6, and neither stack has the advantage there.
This is factually wrong. I have a VPN between my VPC and my house so services can communicate securely without configuring each one separately with TLS.
That's a valid criticism of Proton VPN, but if it works even just on Linux it's sufficient to demonstrate that v6 doesn't eliminate the possibility of VPNs.
Perhaps this is the difference, some people are concerned with being anonymous from companies like google, amazon, etc. Some don't mind that, as long as they are anonymous from a government.
Your mention of subpoena suggests you don't care about google tracking you.