thats actually really awesome.
that said, typically the way it works (at least to my non-technical understanding) is that the hosting provider has to store all the raw data coming in and going out as a matter of law. So the question isn't "is the ip info mapped to usernames", its "is the ip info mappable to usernames"
The answer is probably yes, but there's no reasonable way i can think of to stop that from being the case.
Not in the United States, but my guess would be there are some back-room deals (or just government assets inside Amazon's organization) that make sure they get a realtime feed of all that data anyway.
I was like 85% sure you were wrong about the US not having a data retention law, but i checked and youre right. TIL