Purely technically speaking, no problem at all. But that would break the security chain, and the protection of the SMP protocol would be broken immediately. Up to now, every data record is only linked to an individual UUID. But the moment you go onto the site, browse around there, and possibly touch content that belongs to you, the protection is gone instantly and your IP can be verified directly. And that's exactly what we don't want. Keyword: tracking in advertising 😉