Has no one given it the thought that by revealing too much information could result in a decreased chance of getting those coins back?
Anyone else remember when Pirate said that people making a stink would be at the end of the queue to get their coins back? It was right after BrightAnarchist got a bunch of people together to hire a lawyer and see what could be done. No more than a day or two later Pirate came out with that announcement and the group disappeared instantly.
It's certainly possible that the coins could be seized by law enforcement and Ukyo might not be able to discuss the details there. He also might have burned through the money in any number of criminal ways and doesn't want to say anything that could be an admission of guilt.