The no-cold-call policy did not mean that employees were off limits completely. We hired lots of people from ILM, Lucasfilm, Dreamworks, etc, but they came to us.
The "evil" of this particular case is pretty overstated. I was there at the time, and basically understood it was happening, and it didn't bother me in the slightest. All those other VFX houses treated their employees like cattle.