The industry is next door to idols, voice acting, and regular acting. It's natural to think that stuff is happening. Not at the A-tier corps, but where the business is already marginal and someone makes an offer you can't refuse...
This was always the endgame. You can't start by being a porn site, when you're small you have no leverage with the credit card companies, hosters and all the rest of it. But it's where the money is. So you establish yourself, and then open up once you're too big to cut off. Same thing as Steam where they're now a porn business but no-one thinks of them that way.