In addition to the rating it should have an ugly warning on all its promotional material, like cigarettes.
"Warning: this game requires additional in-game purchases and gambling to access all of its content". On the screen for the entire duration of any trailer.
Yep, this is already a solved problem.
About 60% of the people in Vienna live in public housing and its one of the best places in the world to live.
Tons of people in this thread are running around coming up with Rube Goldberg schemes of incentive structures and legal frameworks when the problem is really not that complicated.