As my father always told me. Anyone selling you a system to win at the casino/racetrack/stock exchange is a scammer. If the system actually worked then the system would not be for sale.
That's not quite right. For super high Sharpe ratio strategies with low capacity, sure. But for a single digit SR with high capacity your expected profit will be higher by taking a fee on a larger capital base. If you also add in asymmetric fee structures then you see why hedge funds make sense.
This isn't a financial model, they aren't selling the system itself, it's all tooling for data access and financial modeling. It's like they're setting up an OTB, not like they're selling you a system to pick winning horses at the track.