Fediverse for teens - lemm.ee

I have three teenage daughters who are currently not allowed on social media. But I want to give them some ability before they become adults. My eldest gave me a PowerPoint presentation on why she should be allowed on Snapchat, lol.  She made some good points. Her friend group has a group text and she wants to keep up with everyone but doesn’t want to get the ding notifications constantly.  Feels like a good opportunity for a Fediverse platform. Like a closed Mastodon/Pixelfed server and have some parental controls. Any projects out there?