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GOG was the first digital games store dedicated to it.

DRM was actually extremely unusual for games before Half-Life 2 was released, so there wasn't much impetus for early services to declare themselves as DRM-free until DRM became prevalent enough that not having it was notable.

Off the top of my head, I recall games bought from Reflexive Arcade sold games with no DRM (but required an unlock code after installing), and DotEmu had nothing even resembling DRM.

Clear answer: No.

By definition the first computer games were ALL DRM free. DRM was later introduced by the devs/publishers out of various reasons. BUT we gamers made the mistake to accept it instead of voting with our wallet and flatly deny them to continue this scheme. Or some people didn't care, whatever.

One game which was hit hard was Spore, but even that was not enough. So long they (devs/publishers) can make money out of it, they don't care.

GOG was the first to make DRM-free an integral part of its service, such that it is impossible to sell here if you want to make your games DRM-free.

Desura and Shinyloot were also known for DRM-free, but Desura allowed DRM'd games while Shinyloot added DRM'd games later. Both services failed and both are cautionary tales of why you don't abandon your principles. True, but now waiting for some Valve apologist or another to tell us all about how disc-based copy protection was "DRM".

Of course. I would say that DRM was invented when publishers realised that the various methods of copy protection used earlier were no longer sufficient (and when they were, they were too effective and generated outcries because people's disc drives broke when trying to play the purchased discs).

I would say that Digital Rights Management was invented when it gave publishers the ability to Manage Rights. Disc-based copy protection removed that ability post-sale. At best, it can be described as "Digital Rights Protection".