Half-assed explanations for things are pretty common in anime so I tend to overlook them, but this is just nonsense. He gives away 10 billion because of a law and that's supposed to be some grand statement about the importance of the law and drop the crime rate? I hate to say it, but it really seems like the writer doesn't give a shit about logic. Narratively its been decent so it doesn't seem like they're stupid. I would like to keep reading but it's hard to take this seriously.