On most games yes, like I said before I've copied games from my computer to others to play in lan to convince friends to buy a game.

Then there are badly implemented games, where you need to either delete the steam library from the game folder or replace it with an open implementation.

And the rest are the ones that have DRM (which are not available on GOG anyways so they don't matter for this discussion).

Morals

Nothing moral about a store that affirms Microsoft's Windows monopoly.

Yup, GOG just has good marketing department and lots of people fall for the DRM-free (but not really) games you own (but not really) campaign.

For most people that is a distinction without a difference.

So what's the difference to making a backup of my Steam folder? The games I play have no DRM either.

Yes, but the same is also true for Steam, so it's a moot point.

But the same is also true for Steam, so it's a moot point.

but your pedantry is making you miss the forest for the trees, basically.

No. People here claim, that just because GOG cannot remote wipe your drive, people buying off GOG have a perpetual right to the games they've bought. But they don't because that's not how copyright works. If a game's license is revoked, to keep playing the game is copyright violation.

Not only do so many people not grasp basic concepts of copyright, they claim Valve could take away all downloaded games. No, Valve cannot remote wipe my drive either. I can back up my Steam folder. Many games on Steam don't have DRM at all. It's opt-in and the actual Steam documentation outright says not to rely on Steam DRM because "it is easily removed by a motivated attacker." If games rely on crap like Denuvo, 3rd party launchers, or invasive anti-cheat, the publishers are required to clearly state so on the store page in one of those orange boxes. Users can make an informed decision on a per-game basis even with Steam. And those games that ship crap like Denuvo aren't on GOG in the first place.

So in the end GOG is a store that stretches the truth about game ownership in their marketing and despite all their Witcher and Cyberpunk money, they don't care about users of platforms competing against Windows at all.