https://support.gog.com/hc/en-us/articles/212632089-GOG-User-Agreement?product=gog
Check 2.1, GOG is the same.
Legally, it’s still a license, it’s just effectively impossible to revoke.
Edit to expand on this: A truly offline forever-purchase of physical goods can be re-sold. See https://en.wikipedia.org/wiki/First-sale_doctrine (this is the US-specific version, other jurisdictions may have similar doctrines).
American legal concept that limits the rights of an intellectual property owner to control resale of products embodying its intellectual property.
A digital “purchase” is usually non-transferable, even from GOG. It can’t be removed from your own HDD once you download the installer, but there are still restrictions attached on what you can do with it, even if those are limited and hard to enforce.
I mean at that point you can just make backups of your steam games too. A lot work straight from the exe and for the rest there are steam simulators.
A small minority of GOG games have DRM, a majority of Steam games have a form of DRM. “Use a simulator” isn’t a solution, I shouldn’t need a third party program to play the games I paid for.
Also there’s a pretty big difference between downloading the installer and backing up the installed files, one is an intended backup solution, the other is a workaround.
