WHBM,
This particular incident was no fault of the airlines or the maintenence practices thereof. It was a bad part from the vendor that failed. It was the rear engine yoke that bolted to the flange of the engine case that failed.
As far as freighters go, they typically are operated at max gross weights whereever they go, unlike pax birds. That takes a toll after many years. Also, freighters often go into rather rough airstrips in remote places around the world on regular basis, that too takes a toll. Do the math, it adds up.