One has several IP addresses with IPv6 enabled as can be seen in the screenshot on the right.
The last part of an IPv6 address, the Interface Identifier, is something like a world-wide unique license plate for Internet devices.
The respective interface gets additional Interface Identifiers (license plates) that serve for de-personalisation to be identifiable from the Internet.
This technology generates a random Interface Identifier for a network device, checks whether this is still available in your network, and assigns it to the device then.
Moreover, the Interface Identifier gets a date of expiry.
The average expiry is one day.
Then, the operating system responsible for the de-personalisation generates a new random Interface Identifier and assigns it to the device again. Thus, inferences from manufacturer or device identifier are not possible any more.