They can ask for a refund and they will get it. Go read the vendor agreement so you can give an accurate opinion instead of just an "opinion".
I know there was a pay for performance option in the past (you only paid the monthly subscription fee if a performance target was reached), I haven't visited the site much recently so I don't know if that is still a subscription option.
A friend of mine offered a system on collective2 and got MANY chargebacks, and his was a profitable system. People would sign up, take the signals, and then cancel and demand a refund. It is why it takes 90-days to receive the fees from clients. The owner of C2 makes sure the chargeback deadline is past.
OK, here it is: "Refunds and exceptional charges. If your subscriber is unhappy and demands a refund of fees paid to us on your behalf, or if an unhappy customer calls his bank and as a result we are charged a special fee - called a "chargeback" in credit card jargon - then we will remove that fee ......" So I was kind of incorrect, they can and will refund for ANY reason. I said not for underperformance.
My buddy says he earned $7,800, net of C2 fees, over 2.2 years of running his system. Certainly not worth the aggravation. His system was in the top 5 for the entire period to give you an idea of the potential, if any.
which system? "Top 5" is a very subjective concept. It depends on the system metrics, which markets, etc. Frankly, almost all systems there are not worth anything - starry eyed paper traders who think their 6 month worthless backtest will generate $50,000 in subscription fees