The N64 is got objectively better graphics - being able to do perspective correction, having actual awareness of the fact that 3D objects have depth (z-buffer) and floating point precision. It's just extremely harmed by the low storage of the cartridges.
The PS1 can barely do 3D, being forced to calculate polygons but having no idea what to do with them, with warping geometry and textures deeply distorted.
They have allowed content protected by DRM into their store four times already, which is not surprising, given GOG is owned by CD Projekt Red who included DRM into their own DLC for Cyberpunk, including on GOG. That's not "strong" in any sense of the word.
So in other words, they sell you the "feel good" anti-DRM narrative but quickly look the other way when it's good for business. At that point, might as well purchase on Steam, where DRM is common but optional and Valve actually cares about making the games platform-agnostic, easy to backup, easy to share, etc.
EDIT: cool downvotes, doesn't change the fact that GOG provides software protected by DRM on their "strongly anti-DRM platform". There is no amount of downvotes in this world that can change this reality.