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That on top of the fact that when you get new rotors, they have oil all over them anyway... how many shops do you think actually use brake cleaner to get that stuff off? Sure, it's a liability if you wreck your car due to their negligence in not cleaning the light film of oil off the rotor before installing it, but the fact is, for many years, a large number of "mechanics" have been doing without this step... and there hasn't been any issues that have come to light about it, have there?
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I always clean off the goo, and use a sanding wheel to scuff the surface to help seat the pads. Every brake shop I have seen does these things as well, and I thought it was standard procedure. However I don't doubt there are shops that don't. Many shops do a lot of bad things, like tighten lugnuts with an impact with no torque control and strip or break studs.