If there is an US gov investigation which is forcing Mark to cooperate they could issue a gag order, that would explain the silence.
That would be extremely interesting, seeing that Mark is a French citizen living in Japan.
Silk Road users could very well use gox to withdraw cash or buy btc on the early years.
This alone is an excuse for an intervention given that Japan is a very cooperative jurisdiction, not farfetched to imagine a cooperation between Karpeles and the US gov given that he has seized assets on US.
If true, that opens an interesting possibility: Mark may actually be trying to protect customer's funds.
From MagicalTux on bitcointalk:
Someone asked:
back to JPY....a nightmare for the US to try and enforce anything at all or at least quickly and not always on the friendliest terms with regional neighbors
To which, MagicalTux replied:
Japanese government is friendly to US, and also implements things such as FACTA. Also the US government can pressure any bank worldwide by threatening of cutting them off USD. A bank in any country that can not transfer USD anymore is of no use to anyone. US government has been doing this so far to get accounts held by "terrorists" (people linked to North Korea, mafia, actual terrorists, etc) and while Bitcoin is still too small to get this kind of response, it's a good idea to stay friendly with the US govt. at this point and let Bitcoin grow and gain in legitimacy.
Once again shows his willingness and desire to cooperate with the US Gov.