This is a really good argument until you learn that mass shooters are less than one in a million but child sexual abusers are more than one in a hundred, despite there being tens of millions of FPS players and probably only hundreds of thousands of CSAM consumers in America. It's a catchy gotcha but it completely fails to hold up under material scrutiny.

Mass shootings and child sexual abuse are very different things, and so are CSAM and video games. You would benefit from losing some of the reductivism you've got there.

"characters who are petite/young-looking but not obviously underage"

yeah of course they're not gonna come out and say "yeah we want to host and share drawn CSAM" and they're going to be weasely and sneaky about it, do you really plan to take pedophiles and pedophile enablers at the honor of their word here

the venn diagram is a circle

also, that aside, "the resources" here are a little different, mounting investigative operations to bust lolicons/pedophiles (same thing) requires more resources than just flipping the switch off on some pedophile's ability to communicate freely