You can download and keep the installers forever in your personal storage somewhere, and install them without the need of Internet connection.
When you buy a game from GOG you’re buying without DRM and have all the installers available to download as backups. Regardless of what the fine print may say, this is effectively owning your games forever.
SomethingBurger@jlai.lu 1 week ago
However, if you don’t ignore the contract you signed, this is effectively piracy. Which is fine, don’t get me wrong. But you still don’t own anything. BTW Steam has plenty of DRM-free games which you can run without Steam; backing them up is a more manual process but the end result is the same.