I get a feeling that this is a roundabout way of simply anonymizing the ID in the data when it is collected, as have been done a lot in studies. The problems with this is that our behavior is unique enough that is it often possible to find out who you are (or what demographic you are in for advertising purposes) from your actions, no unique identifier needed.

One example of this is when our national newspaper (NRK) did an investigation[1] on "anonymized" GPS data, and could easily find the identities of the persons they belonged to.

[1]: https://www.nrk.no/norge/xl/avslort-av-mobilen-1.14911685