I am a mobile gamer, and let me tell you - those games are amazingly well designed at being addictive, you loose track of everything, and you keep spending at 10$, 20$ daily, sometimes more weekly, then paycheck so you buy smth for 100$ and bam...5k gone in month.
My point being: yes, protect children, but dont forget about adults, they get addicted too! Everyone in my guild are adults to my knowledge, and they all spent much more than they wished too.
Honestly, id like to see a cap on how much you can spend on game per month, that would actually also help gameplay