To quote a comment in the linked article that is in the same vein that stood out for me: "if I want to be titillated by softcore crap, I know where to go and it ain't the app store."

What makes you think the only adult content possible is porn in the form of images/videos (or maybe even erotic literature) one views in a browser?

The "you can look at porn in your browser" thing is getting really old and stinks of the time when Apple was all "webapps should be good enough (on the iPhone)!" back in 2007. Yeah, that sure worked out well.