I know exactly what you're feeling, I've got kids (one of them also 9) and it's one thing to say "let them play what they want" but it's another story when you're seeing just how much time they're spending on stuff that is just hollow and exploitative. Honestly it makes you feel like it's your responsibility to help your kids understand that they're being manipulated.
On the other hand, I look back at the games I played when I was their age and while I did play the classics we revere today I also played a bunch of licensed/lazy junk, and being able to play the bad stuff is what helps a person form an opinion and make their own tastes and determine what they like/dislike. So yeah, we know that YOU know better, but sometimes you need to let kids experience for themselves. Try to tell yourself it won't last long
On the other hand, I look back at the games I played when I was their age and while I did play the classics we revere today I also played a bunch of licensed/lazy junk, and being able to play the bad stuff is what helps a person form an opinion and make their own tastes and determine what they like/dislike. So yeah, we know that YOU know better, but sometimes you need to let kids experience for themselves. Try to tell yourself it won't last long