Another thing to consider is that GrabCut is patent-encumbered for commercial use -- it relies on the mechanism described in Zabih, Boykov, and Veksler's "Fast

Another thing to consider is that GrabCut is patent-encumbered for commercial use -- it relies on the mechanism described in Zabih, Boykov, and Veksler's "Fast Approximate Energy Minimization via Graph Cuts," which is patented in the US since 2004 (Patent No. 6,744,923).