To be honest, I'm a little more worried that there are apparently some remnants of the DRM in the executable.
true. that is a valid concern. the thing is that drm might be embodied into the core of the program and simply cannot be ever removed without reprogramming a huge chunk of it.
it is far from simple: removing few lines of the program and there is no drm.
so as long as the drm is inactive the game is drm-free.
cracks are illegal. so even if gog is thankful they CANNOT credit the creators.