card predictor system - scam or something to be worried about?

[SheetWise]

Almost all RNGs in use today use external inputs -- many (like MS system, which can be predicted) are algorithms that are seeded. Some use temperature (out to 12-14 digits), some measure electrons. You can be fairly certain that the output is random -- but that only means that it can't be predicted. The real question is when and where is the data generated, and how is it handled.