Right. And there is absolutely no legal justification for requesting you go fetch those bits from a data center hundreds of miles away and show them to the CBP

Right. And there is absolutely no legal justification for requesting you go fetch those bits from a data center hundreds of miles away and show them to the CBP employee. However, they are hoping that people don't know that and do it anyway, even though they don't have to. Also, a lot of CBP employees probably don't understand that distinction anyway. It feels like it's all "on the phone". Of course that distinction between data in your possession on your device and data that's hundreds or thousands of miles away might not matter if enough precedent accumulates to support forcing people to go fetch things when they're at the border. So we need to stand up for freedom from government intrusion now!