I see the same thing on my Horsethief. The seatstay bridge is getting dinged up really good and the chainstay bridge is getting a few superficial scratches. That top bridge looks pretty beefy and the hits on the lower bridge look superficial so unless there's chance of structural damage, I'm not too worried about it.
I still have not added protection and it is getting much worse. I really enjoy this bike but know at some point I catch a rock at the right time and size and that mount will crack.