Itchio makes the distinction between pornography games which glorify incest, rape and child abuse etc - and narratives which touch on them in ways which are not glorification. Context and framing matter. Its incoherent to discuss content divorced from context.
I don't think its smart or true to argue "if they ban No Mercy they're going to ban Mouthwashing next". I think it sounds asinine. The worst faith, most catastrophising of slippery slopes.
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With that said, justice for scat porn.