The reason I mention shouts is because the line of reasoning that I've been responding to has been to remove comments entirely from PF and let this all move into shout, which I am suggesting is a worse idea than letting it stay in PF. And agreed with the adult themes, they can anything, people are mainly talking about ERP and Cybering (which are not always the same thing). The wording I used in my example was suggestive enough to communicate it's adult as in lewd but its wording doesn't violate ToS, nor does necessarily the stuff they're doing, so my argument here is that for the argument that we should move it to shout where people will more likely report it and also turn off shout chat if spam is too much doesn't really work if the adverts themselves don't break the ToS and if their activities don't break the ToS because the GM's would let it continue so for the argument being "this is how we'll keep this away from minors" is moot, because it won't.
That would depend on what the law decides and that can vary country to country. Some law views the adult as the sole responsibility and that they hold the responsibility of verifying the age of the participant. Somebody gave an anecdote of a bouncer who lost their job despite the fact the person found a way to cheat the system and get into a bar underaged. Some places can be harsh. So this is the risk you take, it's also the risk you take working in hospitality, retail and so on, because you can get into trouble serving underaged people there too. It's why here in the UK the policy is if somebody looks under 25, you ID them, even though the legal age for most things is 18.
Yoshi P in an interview I think was clear in that if you do anything illegal then they will take action against your account. With reports they will investigate them. With in game brothels YoshiP explicitly said to report them when people see them. He didn't indicate they'd ban them out right, but put in two emphases, one in that they will investigate it and two that they have legal support to help them in most countries. So I think where they are from a legal standpoint is likely to be safe and that they are doing the appropriate things as far as their platform goes. When it comes to individual responsibility, you break the law then of course you're responsible. Unfortunately, you can have all the best intentions and be certain you're doing the right thing and then find you've broken the law.
I agree it doesn't protect minors by being less visible. If anything I think having it visible enough for GM's to be able to moderate and 'okay' enough for people within those communities to report it without repercussions when they themselves have committed no wrong doing is probably better at protecting minors. Because let's face it, who's most likely going to spot a sexual predator in an MMO? People who engage in sexual activities. From a previous commenter of somebody in one of those communities, they pushed out somebody who was doing inappropriate things with a minor and rejected them outright and made them well known. And the GM's knew about it and the police got involved.
And I agree teenagers, aren't stupid. If anything they are intelligent, naive perhaps and in many cases still oblivious to consequences or apathetic of them. I mean, many people try to see naughty websites before they're old enough and many people still try to buy alcohol underage, many succeed...myself included.
I don't think it's entirely hands off. More if they catch somebody guilty of wrong doing they'll act. At least going by YoshiP's comments about then investigating these cases and encouraging people to report them.