Does the BTC legally belong to the company, or the users, if it was given by mistake? Would they be within their rights to sue for it to be restored?
I'm assuming it works the same way as for errors involving fiat currency, but I'm not clear on what the law says in that situation either.
Did they send the Bitcoins to the wallets of the users (i.e. the users have the password, and only the user has the password) or it was just a number in the internal database?