The X factor tracker does not have any bias, positive or negative towards any of the contestants.
It uses langauge and data anaylsis to predict who is the least popular contestant each week, based on what people are saying about them. Aside from the occasions when the classifier is re-trained, any significant shifts in popularity are entirely due to the public, as the programmes works in real time.
If people are looking at the tracker and voting for who is at the bottom this is no different from people looking at betting odds. The results could not be published retrospectively because this would leave the project prone to vast accusations of innacuracy or twisting results.
It is just a resource and an experiment, like many others, and people can use it as they wish.