That is the strange thing. Why can't he register an account in each different site with his own personal informations?

But more than that, it looks like he wants multi accounts signed up in name of different people, what would be a serious legal issue. Obviously he isn't going to give any extra informations on this thread or at any other public one due to the shady nature of his proposal. He just dropped the bait, now he waits interested people contact him privately. I don't doubt he could be a bookmaker operator, but people who want to stay out of problems shouldn't engage in an agreement with him in anyways.