Until he defaults or doesn't live up to the terms of the arrangement, he isn't a scammer and has done nothing wrong.
Yes he is a scammer. He is a scammer because he's paying interest to his debtors from other debtors' money while alleging he's paying it from profits he gets from his business. The business either does not exist at all or does not generate the kind of returns he claims.
This is obvious to anyone who has even a vague idea of how the economy works.
Until you can prove that, its just a theory.