The fact that these constructs exist and only make money when people make mistakes should tell you that enough people make mistakes to make it profitable. This makes it not riskless at all. It makes it predatory.
These constructs also helps people buy more expensive items than what they could afford without credit. I wouldn't jump to that conclusion just because it exists. Credit companies also take small fraction of the transaction. The store is willing to pay that fees because it increases their revenue.
If they can't afford it without credit, they can't afford it with. And vice-versa. There is no credit construction that will make this different, except if it has a negative interest rate. To me this is obvious because if they can afford the credit, they can afford to save.
