I think you've missed the point.

Yes, they're looking to continue selling older titles and your point is that pirating / torrenting is free, but GoG are ensuring the game will actually run on a modern machine - the pirated ones will have problems (not even covering the potential malware ridden ones)

I've been there, done it, got the t-shirt, the t-shirt faded, got ripped and is now a rag somewhere... this is a good move by GoG.