If a developer wanted to work on a new game, looking at the HL2 source would be worthless to them. The code itself is already a few years old, and some parts of it are 4-5 years old. And Valve doesn't have any code Gods like iD does, so the code is pretty standard. By the time a developer spends 1-2 years coding up their game using the HL2 source, it will be outdated by the time it is released. That's the nature of the beast. Now if the source was leaked a year ago, then it would be a total different story. Developers could of rushed things and had their HL2 source based game out around the same time as HL2, with enough time to change things around so no one catches on.
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