A student was playing Minecraft on their personal computer

So on Friday there was a student that had a MacBook in math class and normally all the students have chromebooks and the teacher was teaching a normal but the student with the MacBook was playing Minecraft bedwars on hypixel. I’m gonna assume that this was his personal computer and I don’t know why schools have this policy so I asked the teacher and he said the student forgot to charge their Chromebook. I didn’t tell the teacher he was playing games cause I’m not a snitch but there were loaner chromebooks in the office. (I don’t even know what flair this has to be)