Honestly, this whole situation is overall extremely bizarre.
On the one hand, it sounds like Fantia informed the Tokyo Otaku peeps to no longer sell TORA coins to the affected countries.
On the other hand, they haven't sent out any other official messages of any other kind, and people that were paying for stuff suddenly found themselves unable to access the stuff they paid for, unless they use VPN. I wonder if they can be sued for this? I don't have the kind of time or money to do something that ridiculous, but mayhaps there'll be some people that can and will.
Furthermore, while some people have cited some specific EU initiative as the potential cause for this, looking into it, it has some fairly specific conditions that are unlikely to apply to Fantia (See, regular monthly active users from the EU specifically being over 45 million)... Fantia's reasonably popular outside of JP, but I doubt there's over 45 million European peeps from the EU member states with active accounts over there.
PornHub might not have those numbers, and that's for more well known and accessible to EU users...
So that bit of legislation being the cause seems unlikely in the extreme. Not to mention that it doesn't affect the UK anyway.
I've seen one bit of speculation saying that this might be a more extreme version of what Pixiv did. Pixiv recently created completely separate ToS for the UK and US, specifically as part of their efforts to retain the services of VISA, MasterCard and PayPal. Mayhaps, Fantia is trying to cock-block these countries to regain the usage of VISA and MasterCard, because there are plenty of Asian users with those brands, and there are more than a few clues floating around that VISA and MasterCard have been pushing their stupidity for political reasons more than anything else.
The reality, however, is that no one knows anything. Not even Fantia's business partners. Fantia's totally silent on the subject even though people have been pestering them on the site formerly known as Twitter and via their support e-mails. It's not just followers that are concerned after all, but creators too.