Must be people with a lot of spare time with nothing to do or someone who doesn't know how to disable notifications (I was just yesterday configuring mother's phone disabling notifications after she asked me to disable her lock screen completely since she doesn't use any PIN anyway, she stand no chance with this option buried in hidden Developer options). It's odd to see someone who is neither of these groups keeping them enabled, honestly Notifications should be permission each app should explicitly ask with reason why it needs them during launch and they should be disabled by default.
