Wow that didn't look pretty. I wonder how old it is...!
At the rope gym in my town, we have fixe clip-in carabiners at the top, 2 of them at each anchor, and they have been used for lowering and toproping continuously from about 4p till 10pm every night for many years. Of course they are checked quite often, but they have never looked like this.
They look like
this except we have two biners (one on each bolt) instead of a chain and only one biner.
We use them also at our sport crags and some of them have been on very popular routes (where you have to stay in a queue before climbing) since 1994 and they still look nice. So nobody ever thinks about rapping off instead of lowering, as long as the anchor looks OK - and it normally does.
However using those biners for lowering and toproping requires that people actually make sure that they still do not look like the one you have shown here.