IPv6 eliminates the possibility of proxies / VPNs. Being tracked simply by IP becomes non-optional.

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.

Wat?

It, um. No, it doesn't do that. You can use proxies and VPNs in v6, and you're about as trackable by IP as you are on v4.

Name one VPN service that supports IPv6. Perhaps the most existential reason IPv6 was invented was to make proxies obsolete.

Either you use address translation or you don't.

VPNs as a technology, gre/ipsec and wireguard. I assume others.

VPNs as a youtube sold service. Mullvad/mozillavpn for one

I get an IP of fc00:bbbb:bbbb:bb01::1 and it uses NAT66 to place me in New York despite being in the UK

  1.|-- fc00:bbbb:bbbb:bb01::1                                                        0.0%    10   78.6  80.2  78.6  82.0   1.2
  2.|-- 2607:9000:a000:34::1                                                          0.0%    10   80.1  80.3  79.3  81.2   0.7
  3.|-- ???                                                                          100.0    10    0.0   0.0   0.0   0.0   0.0
  4.|-- 2607:f740:70:101::1                                                           0.0%    10   82.2  83.9  79.8 104.3   7.2
  5.|-- 2001:550:2:d::4a:1                                                           90.0%    10   80.1  80.1  80.1  80.1   0.0
  6.|-- be3448.agr22.jfk02.atlas.cogentco.com (2001:550:0:1000::9a36:1a9)            60.0%    10   80.4  81.0  79.2  82.9   1.5

and on

Proton VPN?

And no, proxies were either never obsoleted or they were obsoleted by routing. Nothing to do with v6.

My bar for "support" is higher than "linux only and you need IPv4 to initialize".

https://protonvpn.com/support/prevent-ipv6-vpn-leaks

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.