[olliej]

1) can be done trivially with first party cookies.

2) you can already tell what device someone is using. If you mean “I want to know if the same person is on different devices” get them to login, don’t try in effectively spy while also providing google etc with the ability to actually spy

3)you cannot know how to target ads on a per user basis unless you are spying on your users. You have no justification that supports a claim to such information.

[danhilltech]

Yea, I think we're saying the same thing. Ultimately both the best choice (for privacy, performance etc.) and the one that's most likely (given adblockers and and ever increasing push for privacy from browsers and OSs) is to stop trying to find a way around adblockers, and simply invest in the technologies that work - http, cookies, sessions, logins, and os on.