I think some apps have 'parental controls' that allow for this, but this kind of labeling would provide a strong incentive to set an upper limit. I think this

I think some apps have 'parental controls' that allow for this, but this kind of labeling would provide a strong incentive to set an upper limit. I think this would benefit the game ecosystem greatly, because the effects of a relatively small proportion of the audience dropping 80-90+% of revenue really distorts game design to try to capture this upper end.