I don’t think the goal is to find a single IP for a crime or something. In that case, law enforcement just subpoenas and they’ll sort out the thousands using the IP to the actual person (possible with ISP participation).
I don’t think it’s insane because the more common use is just to pattern match to identify the individuals. While lots of people may share, many do not (eg, everyone in my home shared an external IP but that is frequently just one person).
Google can use this IP and browser traffic to separate out individuals (eg, I don’t watch YouTube and my kid never checks vanguard) to the level they convince advertisers that they know the individual. I expect this is why my kindergartner sees ads for car insurance.
I don’t think it’s insane because the more common use is just to pattern match to identify the individuals. While lots of people may share, many do not (eg, everyone in my home shared an external IP but that is frequently just one person).
Google can use this IP and browser traffic to separate out individuals (eg, I don’t watch YouTube and my kid never checks vanguard) to the level they convince advertisers that they know the individual. I expect this is why my kindergartner sees ads for car insurance.
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