I’ll be silly, but having a unique address per device, is indeed a simpler vector to track, right?

On topic, I’m not sure I even trust my own password sanitation, and seeing service A and B hacked every other month, I feel weary. Knowing that someday my passwords might be compromised as well, so what should I do as just a person who can’t remember things? Write them down, I guess.

It's common for devices to choose a new IPv6 address within your range at random to perform a new connection / rotate periodically.

Which in turn makes it harder to track vs. your /64 which is approximates your old NAT'd public IPv4.