There is no connection between legitimacy and ponzi. A legitimate company can be ponzi and illegitimate service may not be a ponzi.
By legitimate I mean their business activities are what they claim. There is no way they are actually generating the huge returns needed to pay out their loans to investors by the secret methods they claim. They are not a legitimate buiness.
I am familiar with these signs, but this is only a warning, not an absolute truth.
At the moment there are no facts. In my opinion this service should get a chance. But I can be wrong.
You will never get definitive proof either way unless they open up their records to a third party. Why do you think the service should get a chance? What makes you think they are different then any other ponzi before them?