It's a safe bet to assume that the vast majority of American voters have no idea who George Pataki is. Most polls showed him perpetually stuck at 0.0% for the 2016 race. The only real explanation for numbers so low is "no one knows you're running." After all, even support-free candidates like Santorum and Graham have managed to climb to a lofty 0.6% average.
So it's little surprise that Pataki has decided to call it quits.