Multiple holes in exterior wall studs for electrical wiring
Looks like a standard install.

You can only run so many wires in a hole without de-rating the circuit capacity.

The holes are set back at least 3/4" from the stud surface, add 1/2" for drywall and you get 1 1/4" the length of the drywall screws.  Even if the drywall screw goes into the same line as the hole it isn't long enough to penetrate the wire.  If the holes were closer than 3/4" from the surface then they need metal plates.

There are guidelines for drilling studs/joists in non bearing/bearing walls/assemblies.  Typically you don't worry about the electrician as their holes are too small and if you do worry you worry about the joists not the studs.  

https://www.familyhandyman.com/walls/drilling-holes-notching-and-boring-holes-in-wood-studs/