While others seem to be beating up on the idea a bit, I thought it was a really helpful reminder. Without having thought about it too much, my default assumption would have been that Netflix, for example, would block VPNs by comparing IP against a blacklist of known endpoints.
The underlying concept - checking user level information and comparing against network information - is an interesting and valuable way to think about it. This is a nice, simple illustration of that idea. Thanks for sharing it.