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Something worth note with Mixam is that they're a bridge between customers (creators) and printer businesses. What may be happening is printers who have contracts with Mixam are exploiting NSFW books by raising their prices on that material instead of turning down the work, making Mixam vet it.

I've definitely have heard about works that are not for kids with heavier theme be denied by printer businesses, typically by family owned businesses who have a moral objection to the work. Similar situations happen with countries that would object to certain characterizations.