Both regular schools and universities block Netflix for two reasons: 1. The educators desire to cut down on the distractions available to the students (or, if you’re at work, the employees). 2. The university wants to reduce the Wi-Fi load.
Now, if you’re worried about region locking instead, then it’s all about studios and Netflix having a variety of licensing agreements. Each show and movie has copyrights and different countries have either paid for it or not. This is why every country’s Netflix library is different.