1. If it were a die scratch, it would not appear over the devices.
1.1 A die scratch will not show up the sides of the devices.
2. If it flows over the tops of the devices, then it would be a die crack.
2.1 Circulation wear can remove the lines on a top of a crack, but it would still flow up the sides of the devices.
To me it appears to flow up the sides of the devices. So I lean towards a die crack.