Another annoying thing is if you approve an app from the App Store once, it’s approved for install forever.
Going off what you had mentioned about apps with chat features, we’ve run into times where we’ll approve the app thinking it’s fine, but then our kid finds out they can chat with random strangers and divulge personal information. At that point we delete the app, but they can reinstall it whenever they want without requiring parental approval again. 😬