Disallowing 3rd party cookies wont end cross-site tracking. They want to do it so they will find ways to do it. Even if they ignore all of the obvious and under

Disallowing 3rd party cookies wont end cross-site tracking. They want to do it so they will find ways to do it. Even if they ignore all of the obvious and underhand methods like exploiting E-Tags and Cache headers, they can always just track clients across sites based on their IP address. Yes, that is not as accurate as using cookies, but it is accurate enough to make more money than they would make by not doing it.