Lots of comments here about how IPs aren't PII b/c they can change, etc. I'm not arguing that, but consider that there is an entire _industry_ around using IPs to specifically target people, companies and households that is effective enough for businesses to write large checks to them.
The larger issue that we (HN tech people) treat IPs as fallible because we're thinking of it like an absolute. The advertising side of the Internet looks at them like a goldmine b/c even a 75% correlation to "truth" can still make their ads reach the people they're trying to reach in a much cheaper way.
Household IP Targeting - https://www.vicimediainc.com/ip-targeting-direct-mail-intern...
Or even just your ISP (who for sure know your IP addr and your address) - https://arstechnica.com/information-technology/2017/03/how-i...
The larger issue that we (HN tech people) treat IPs as fallible because we're thinking of it like an absolute. The advertising side of the Internet looks at them like a goldmine b/c even a 75% correlation to "truth" can still make their ads reach the people they're trying to reach in a much cheaper way.