Sounds like a made up problem!

Even in your example, absolutely no one forced anyone to use it as a “social media” app. If it is a matter of convenience to access the notices, or talk to teacher, then use it like how you would use school/work apps such as canvas/blackboard/slack/teams apps. Stop using it beyond it’s purpose. Which is to say, add “friends” if you have to so that you can access notices or messages from your teacher or whatever. But doom scrolling on clickbait and keeping tabs on Exes shouldn’t be done.