First off, as has been stated multiple times, this is about RP venues being targeted indiscriminately. It has nothing to do with ERP, brothels, lap dance, etc. None of this was brought up in the initial conversation that created this.
Secondly, FFXIV is rated T, not PG-13. PG-13 is for pre-teens with a strong encouragement that they be supervised by parents when watching. And, online interaction is not rated.
Thirdly, this is a global game, with servers and head offices in multiple countries. Japan itself has a massive industry in Love Hotels alone. Does the Japanese side of the game have similar RP venues to the North American? What laws take precedent? And do you honestly think anyone in a law enforcement setting (hi, I work in Enforcement) give the slightly care to people role playing lap dances on an online video game? Get over yourselves with the "it's illegal somewhere". Cool. It's not illegal everywhere. And at no point is legality actually coming into these specific situations.
Finally, the Section 10 is vague as hell. Again, Enforcement, degree in this stuff, actually have worked with a law office. "You must not use the Services to distribute any content that is obscene, pornographic, defamatory, hateful, or illegal, or that violates the intellectual property rights or other rights of any person or entity."
Distribute any content. Okay. Is a conversation content? Is an interaction content? Is using emotes and conversation to carry on a public scene that would most definitely be something one might observe in even a PG-13 movie content? What is content? First, you would have to argue that a role play interaction is content. Now, what about obscene? What is obscene? I can guarantee that this is subjective. Furthermore, something that would be obscene in visual media is highly unlikely to be considered as obscene in written form. What about pornographic. Displaying of female breasts might be considered pornographic. Although, several states have made it legal for women to go topless, so even that's not universal in North America. We cannot actually show nudity in FFXIV. Is saying "naked boobs" pornographic? I think not. "He spun his ding-a-ling like a meme of yesteryear". Again...highly doubt that's going to fly. Besides, those are the vastly rare situations. And when ERP does occur, it's a consensual choice between two people. It is not being distributed to the community.
You want to throw around legality? Well, that is how legality actually works. Lawyers tear theses things apart. And officers always think in terms of viability in court.
That's why Terms of Service are universal, and outlined by a private business that doesn't have to actually go to court to do anything with you if you do something it deems to go against said ToS. Legal support in various countries, as Yoshi P claims to have, is for much more serious offenses. ToS doesn't use legality. They use a banhammer.
Going to an 18+ venue, where the goal is simply to have an adult clientele, where there is literally nothing more than dancing and a bartender is not obscene, or pornographic, but it still wants an 18+ group. You know what else demands 18+? Voting. You can't say that advertising 18+ is inherently anything even questionable. And dear lord, even if it's two people consenting to erp who cares? It's those two people "risking" anything. I swear, the people that are against erp come off like they expect to be hogtied and forced into a rp orgy or something. You don't have to be into it, or even like it, but it's the oldest profession in the world. It's gonna endure.
But, again, not. the. point. The point is using the Party Finder to advertise any sort of social interaction that isn't content. Which... by that logic, erp isn't "content" and thus can't fall under section 10. I mean, based on Mr. GM W.