[gaius]

I'm not logged into my Google account and they don't see where I go.

If they see activity from one IP to say search, then activity from the same IP to visit the top result of that search, they don’t need a cookie to track you.

Anyone who shares an IP has seen ads actually targeting another member of their household...

[8ytecoder]

Usually that's not a reliable way to identify a unique user. Given the prevalence of NAT, re-using IPs by ISPs with DHCP, and a host of other reasons. (That's not to say there aren't ways to fingerprint users across devices and browsers.)

[gaius]

A service ISPs should offer as standard is regularly randomising your outbound IP from their pool for all but a whitelist you specify. So you can have a static IP for say you work firewall, but are harder to track otherwise

[ams6110]

Most ISPs are in bed with the advertisers and tracking. That's one reason I don't use my ISP's DNS.

[kasey_junk]

Do you use googles?

[rectang]

Yes, that is possible -- and I'm sure that other trackers are doing their best with fingerprinting, etc and that they manage a certain amount despite my having Privacy Badger and uBlock Origin enabled in my main browser.

However, IP based associations do not show up in the user history that Google allows me to see, and as far as I can tell Google does not change my experience based on it.

I'm still subject to some filter bubble effects because I only zero out my main browser every few days.