That probably would be a better solution. Particularly since the rating system is pretty easy to ignore. And if they do start slapping the R18+ rating on games that don’t really warrant it like Mario Party, people will be more likely to simply dismiss the entire system.
I would hope that the government and ratings board wouldn’t be that stupid, but look at how long it took to give us an R rating for video games in the first place.
To save everyone a click, the game is Freedom Wars.