Well - that "math" can be used to build cars, ships packages, pilots drones, monitors a patient's vital signs.  We somehow can patent the mechanical devices that can automate that, but once you put code inside of that to replace some of the moving parts you can't patent it anymore?  For ever "obvious" case of patent trolling if you think a bit I am sure you can come up with hundreds of cases where the line s a lot more blurred.