Squid Game has been accused of that and a few other things.Would'nt we? If Squid Game is accused of causing widespread violence in schools and the costumes banned for Halloween in some of them, there is little reason to think tabletop RPGs aren't guilty as well, just being much more niche than a Netflix show -- where explicitely bad guys do the violence, while in RPGs it's often the PCs who do it.
Is there proof it has even caused violence? Or is it one of those 'accusations' that is born of fancy, as a lot of accusations of x causing violence are? Or perhaps false accusations born because the series just so happens as well to be a criticism of politics in Korea that is also applicable to many different countries around the world?
Video games have been accused of causing violence or encouraging it. Studies upon studies have disproven this, repeatedly. There's never, at all, been proof they do. They, at most, can raise aggression, sometimes.