I think that you might possibly have a case if you were getting the vast majority of your customers through TAG, but is that really the case? If not, then any reviews you get on here aren't really affecting your business in any real way I would suggest.
Just as a comparison, there is a site in the UK for independent escorts (it's also used by agencies to some extent as well) called adultwork.com where feedback and reviews do play an important part and the site does remove adverts, or give warnings, when it is alleged that fake photos have been used. There is a similar site in France called 6annonce.com. You can think of these sites as a bit like Uber for escorts - the UK site has around 3,000 providers in London and more in other cities and the French site has around 500 in Paris and more in other cities in France.
Ok, to give you some insight on the J market:
I'm pretty sure Hana DOES get most of her clients from TAG when she's not touring. TAG is the biggest and most reliable platform for escorts focusing on the international market. There is backpage, but its unreliable and most of us have stopped using it. There are two or three other sites that most girls have made an ad on once in a blue moon but they dont gain much traffic at all.
As for comparing TAG to the other boards, no there are no such boards in Japan, TAG is the biggest and while its much smaller, that actually makes it MORE reliable!
You say that the European boards do "some checking" but with 3000 escorts, some fakers must slip through the net.
While with the girls who advertise here on TAG, i'm pretty sure the management has met them in real life, or at least that used to be the old rule. The management personally make sure that the escort is the same person as in her pictures and generally try to screen their attitude a bit as far as possible.
Plus while some of the review posters are people who havent contributed to the forum (mostly guys who made an account and read some, found what they are looking for, then post a review of that service and leave the site after that when leaving the country), some of the guys who have reviewed us are well known people on TAG. They have made so many posts that people get a good idea of who they are and some may even have met them during a TAG meet up event that we used to have a few years ago. So they are definitely real people and not girls who write their own reviews.
Hana has been advertising on TAG for years. A lot of people on here have met her and can vouch that her pictures are accurate (she's super youthful anyway, using 10 years old pictures would have the police going after her and the site!) and her reviews are by reliable people and speak for themselves.
I do understand that some guys would still not want to go though the hassle, but i cant imagine anyone not making a deposit because they think Hana will run off with their 5000 yen. She's not some random backpage girl, she has build a reputation here.