You are right, best place to advertise that kind of sports is on pornsites and they could get more attention.
You said that their target audience is young males, but I think their target audience could be porn addicts.
This is not sports but pure pornography. I am glad that the the Swedish Sports Confederation refused to officially recognise this activity as sex, it would have opened the doors for other nations to follow. Some females are addicted to pornography, so it will be viewed by interested individuals.
It will be viewed by interested individuals like you said but not only that, it will also forced some persons to gamble, especially those that never had interest in gambling, because of their likeness for anything pornography, they will see it as an avenue to gamble on what they like. It is good that these was not accepted, if not, it would have even been more rampant than some games.