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You're thinking of MAC addresses. Machines don't have permanently-assigned v6 addresses, rather the IP is assigned by whatever network they're currently attached to and will change based on that network's whims, just like it does in v4.

As if people doesn't already carry always online machine in their pockets

> Okay, maybe it could be worse if each user account is assigned its own unique IPv6 perma-cookie.

They will. One from facebook, one from google, one from tiktok, several from Palantir and its partners...