It's not totally nonsense. It's an app, you install it on your phone, it tracks your activity (just steps), then you can post it on steem/hive. It also gives you some AFITX token that you can trade in Steem Engine.

In a rooted phone, user can access system files and grant other normal apps to have the permission to access system files. When you have this kind of access, you can do many things that normally you can't, like telling an app that you have purchased all the in app purchases (while you haven't, using patching apps), uninstalling system apps, removing in app google adds without paying. Also you can mess things up. 😄