How can you tell what demographic am I in just from my IP and browser fingerprinting? Do you have more sites or correlate the data with third parties?

I think is fine if you just count the browser,OS, and country the user is from but I don't think is OK to keep more details then that

And to see what devices you should support? If all your traffic mobile? Maybe the mobile version gets more love. Lots of old ie users? Guess you gotta use old school css.

Now that I think about t I’ve never used analytics for anything ad related.

If someone hits you from an iPhone 6 in turkey you can just incrementally your count of those two values without needing to store that IP 13.157.207.156 is in turkey and has an iPhone 6 and youve correlated that data through Facebook's ad network so that now they having a profile built around them despite not even having a Facebook account.

Everyone's been sucking up all the data they can just in case they need it, and actual people are being harmed by it through data breaches. I get why people are upset about these changes happening to their businesses, but what did everyone expect when the industry has failed to self regulate against their worst excesses? The rest of society isn't just going to let you hurt them so you can make more money