Those two things seem to be separate enough. Not only is there a very blurry line in between the two, but also creation of the disallowed content is much safer

Those two things seem to be separate enough. Not only is there a very blurry line in between the two, but also creation of the disallowed content is much safer to do there than to apply to a shady studio to get yourself out there. So the second question would propably be why is porn disallowed in the first place? Is it the payment processors who don't want to deal with chargebacks? Something to do with investors, perhaps their own "morals"?