The usual best method is to just accept that the works are regarded as problematic for a reason and that people are using them to work through their own life issues in a way that doesn't harm others. The usual argument of, "it's just a drawing," falls short, because the next question is, "if it's just a drawing, why do you find it sexually stimulating," and the answer that's been come to before is, "everything in your field of view is shapes, you recognize people by specific collections of shapes, but certain collections of shapes (child-body shapes) imply certain meanings about the person inhabiting those shapes. While anime is kind of notorious for playing with that line in taboo with the little-girl-is-a-thousand-year-old-dragon meme, people ultimately are forced to confront, when they look at it, that you're attracted to the visual indicators of what would normally indicate naivety and ignorance, of an abusable differential in experience. In fact, divorcing the shape from the intellectual state implied by it by saying the person in the little girl body is 1,000 might be worse, because once you divorce the persona from the form, the true hyper-fixation on the form becomes apparent. If you say the 1,000 year old can be anything, like a shapeshifter, why do they choose to be the little girl? Isn't that purely for the author's self indulgence to be explored in some way through the work?
The best way to deal with antis then, is to just own it, say yes it's problematic, yes this seems to be why, and if you don't know why you like it, own that too, and accept you might have some soul searching of your own to do. Everyone has that.
As for people making money from it. There's always been prostitutes. Drawing degenerate lewds is just another form of sex work