^^ This!

My 4th grader has some sound sensitivity issues, so he uses that as an excuse to go out in the hall and read a book or listen to an auto book on his school-supplied chromebook when the classroom gets too loud for him

Well, guess what he's been doing? Watching unfiltered youtube! He's clever and sneaky, so it's been an arms race at home to block youtube enough for him but still allow it to work on my Roku for me. Why does the school allow 4th graders to have unfettered access to youtube?