Our district uses Light Speed Content Filter. It uses a web proxy with tls decryption to read the page content and block certain videos flagged by the AI. Works way better than our previous system. That being said, now the issue is a matter of distractions. They can watch "appropriate" videos, but they just watch at inappropriate times...like during class or at lunch. As a parent, I take an allow-list only approach to YouTube. they can only watch individual videos/channels I select. everything else is blocked.