GoG about page explicitly talks about owning, and terms even explicitly mention advance notification so you can download Dr free versions if they will ever become unavailable.
GoG terms do not qualify purchases as temporary access licenses - only to the degree of servicing downloads as long as possible and without other limitation.
We don’t believe in controlling you and your games. Here, you won’t be locked out of titles you paid for, or constantly asked to prove you own them - this is DRM-free gaming.
What makes you say so?
GoG about page explicitly talks about owning, and terms even explicitly mention advance notification so you can download Dr free versions if they will ever become unavailable.
GoG terms do not qualify purchases as temporary access licenses - only to the degree of servicing downloads as long as possible and without other limitation.