Not the original commenter, but here's a more recent anecdote: My wife and I were staying at a family farm outside the US for several weeks during Covid lockdo

Not the original commenter, but here's a more recent anecdote: My wife and I were staying at a family farm outside the US for several weeks during Covid lockdowns. We had data turned off since our plans would charge us hefty fees for international roaming. One day we took a walk outside WiFi range and I was explaining how grain augers operate, since we were walking to a few old rusted ones. About a half an hour after we get home, she shows me some advertisements on her iPhone for new grain augers. Could it have been the IP address we were on? Perhaps, but the owner of that family farm no longer farmed for a living and hadn't been looking into purchasing new machinery for more than a year; to add to that, we had been there two weeks prior with no farm equipment advertisements.