I apologize if it wasn't clear: He could offer a percentage of profits to his employees/contract coders that work on making this in addition to their salaries/contract pay.
He could not offer financial returns to the kickstarter backers. That would definitely violate the terms of service (though I don't see a way it would be otherwise illegal, assuming no fraud or deliberate money laundering was involved.)
He could not offer financial returns to the kickstarter backers. That would definitely violate the terms of service (though I don't see a way it would be otherwise illegal, assuming no fraud or deliberate money laundering was involved.)