I think light and darkworking are almost the same thing. Differences in conduct don't really arise in practice. If you read my post
here, you'll see some of what I mean.
Let's look at my friend 5 years in the future. At that point he'll be running a successful company. He'll have opportunities to legally crush some of his competitors. A lightworker, with a perspective of abundance, would think that there is plenty of work for everyone, and would just keep providing service. My friend, as a darkworker, would also want to stay on good terms with the competition because he would never know when he might need something from them in the future.
Microsoft (dark) and google (light) generally just buy out their competition. With the money my friend will have, he'll have the option to do this as well.
As a darkworker, he may attempt to intimidate or scare the competition into selling at a lower price through negotiation, or by skewing facts. A lightworker would also try to get the best deal they could on an acquisition, citing charity in the negotiations; getting the best deal grants a lightworker more capital to provide future services.
In our society growing and evolving a business is much more about dedication and persistance than motives.