I remember them trying that when I was in school. It didn't work. For one the school's IT staff was helplessly incompetent. But also the task is far more diffic

I remember them trying that when I was in school. It didn't work. For one the school's IT staff was helplessly incompetent. But also the task is far more difficult than it sounds. There are a ridiculous number of ways to circumvent blocks. Another issue is being overly zealous in blocking. I had a lot of difficulty for certain research projects due to blanket filter bans on large swathes of information