One demographic I could see it working well on is younger offenders - whereas some forms of punishment could be considered "cool", being publicly forced to do something and wearing an outfit not of your choosing while doing it, I can't see how that would be considered cool. Also, it could avoid them meeting the wrong people while in the joint which might lead them further down the wrong path.

At the very least it would be cheaper than almost any other form of punishment, plus you'd get some garbage picked up.