IP addresses can be uniquely identifying. I've had the same IP for years, it's static, and if you did a Google search for it a few years ago, you got straight to my full name and location (because that used to be on whois database for my domain names, which point at my IP; thankfully they no longer include that info in whois).
They don't meet the legal standard for identifying in the US so I think it's suspect to assume they are identifying in other contexts. I know some people will try.
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IP addresses can be uniquely identifying. I've had the same IP for years, it's static, and if you did a Google search for it a few years ago, you got straight to my full name and location (because that used to be on whois database for my domain names, which point at my IP; thankfully they no longer include that info in whois).
They don't meet the legal standard for identifying in the US so I think it's suspect to assume they are identifying in other contexts. I know some people will try.