I quite like the idea of allowing advertisers to create profiles, but only with one week of data. I would support that as a regulatory constraint. You might get

I quite like the idea of allowing advertisers to create profiles, but only with one week of data. I would support that as a regulatory constraint. You might get the same basic results analytically, but it feels less invasive to know that if I don’t want something to be known, it’ll be gone in a week.