Besides the fact they nobody knows what is being done behind the scenes to ensure results are (or aren’t) fair, using a sample of individuals that are all attempting to play the system against each other deeply and irreparably biases the data.
On top of that, jokes like the one I responded to and comments like yours only serve to legitimize a “service” thats sole purpose is to squeeze every penny from its users. It doesn’t provide anything beneficial to anyone but its owners.
Soon enough we’ll be far enough along to go back to the future of Back to the Future 2.