In mobile networks I've only ever seen one UE get one /64, meaning most IPv6 users in the world does not share their /64 with anyone else, if I'm not very mista

In mobile networks I've only ever seen one UE get one /64, meaning most IPv6 users in the world does not share their /64 with anyone else, if I'm not very mistaken. I think this is standardized in 3GPP but I won't dig for it. Other sites should get a /56, including home users. That's in RFC 6177. This is a best practice RFC of "shoulds" rather than "musts" so technically it's still IPv6 if your ISP only give you a /64 for your site... but it's wrong. Your LAN devices (if you only have one LAN in your site, typical for a home) could still all be in the same /64. But the difference between one home and one person is small in the context of tracking for purposes of advertisement and besides, the trackers get extra bits per device which were hidden when the same devices were behind one IPv4 NAT. Poorly hidden, as all devices probably had different user-agents or resolutions and a hundred other things to fingerprint anyway but still, slightly less accessible.