Of course if WOW does decide to stop providing their shoppers QFF points they are to blame. I doubt QF initiated any decision to terminate the relationship, WOW quite rightly analysed the cost and determined how much additional profit was brought into the business by the relationship, especially with the increased cost of QFF points, and then decided to either try to renegotiate the cost or failing that put into place something else.
I worked on the exact same issue with QF over a decade ago and we decided to reduce the number of points per dollar to keep the same level of profit, something our competitors did within 6 months as well.
The choice remains with the partner, QF just wants to sell the points for dollars and ensure their brand is not tarnished by their partners.