There is no proof that he actually stole anything. He ran a site called ore-mine.org that was a HYIP and it (supposedly) made all its profits from trading bots, mining, and ads. It was around for about 1.5 years and recently closed down. The owner claimed that the site and servers were seized by the government and that he has no access to them and is trying his best to get everything back up and running. This could obviously be an exit scam, but there is no solid proof of anything.
As for your question, there was tens of thousands (maybe hundreds of thousands) of user's dollars tied up in there and whether he is a scammer or not, he owes everyone their initial investment back at least...