GOG commits its own resources to maintain classic titles playable, now and in the future. We are launching the program with 100 games and will add more in the next few months.
At some point it just makes more sense to run emulators, like it is already done with the classic gaming consoles.
Ideally, we would get a push to release source after a given time, in order to have true conservation efforts.
7 Kingdoms had its source released and was almost instantly ported to run natively on Linux. And from someone who played that game as a teen and truly enjoyed it, I admit it's not that much of a game! There are thousands of titles that deserve this attention.
Off the top of my head I can think of:
Black&White
The Punisher (this title was even censored due to graphical content)
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.
I love that they have Ultima 4 available for free. I spent SO many hours in that world. The "what kind of person are you" value judgment questions at the beginning were remarkably heavy for introspective teenage me.