This is probably a US vs Europe difference in consumer protections though.
Battlefield 6 won't run on your PC unless it has SecureBoot enabled. It's not included in "minimum specifications."
It varies with country but I believe a number of protection laws specify normal use/testing a product is allowed, so you can open boxes and test functionality (norwegian law does this for sure). Excepting videogames from this is arbitrary, the argument from consumer protection agencies goes.
I believe in practice a number of games did get refunded when threatened with formal complaints along these lines, but that's far from a guaranteed thing.
Anyway, GOG decided to go with the generous interpretation (and the one all kinds of electronic goods except games and CDs/DVDs have), which is nicer for everyone, really
Huh, we have different laws and physical stores. Here, no store will take your game back if you opened the box. Maybe that changed, but in the past any game opened couldn't be returned because you could have either copied the disk, or copied to key and activated it.
I believe there were some pushes to get rid of opened box = no refund policies as being against standard 14-day returns in Norway, because the law explicitly says the consumer may (paraphrase) "reasonably test the use of a product" which allows you to open the box on other goods. But keys being consumable puts them in another category of goods (like food, which obviously can't be returned after "use"), so that doesn't apply.
GOG gets away with their policy because only people who believe in GOG ideallogy go there, and they won't refund a good game. If steam did that, abuse would skyrocket.
And in my country, unless explicitly stated otherwise, most physical goods can't be returned if they are used.
If you took the common sense publisher view then no DRM = everything you make is instantly pirated and the whole store fails instantly. But GOG is a viable storefront, so that's demonstrably wrong.
The evidence is no better for Steam's refund policy than it was for DRM being necessary.
How many developers can make a living based off of GOG revenue alone vs Steam revenue alone?
Depends on the jurisdiction. In Germany you have no right to returns on things bought in a physical store.
It’s maybe the only really “good” actor in that industry left so I try to support them as much as possible
Weaker than standard physical store consumer protections (no playtime restriction on returns, obviously), and (much) weaker than GOGs refund: 1 month after purchase, no playtime restriction.
I believe they explicitly called out the equivalent for physical stores and european consumer protection in general when they announced the policy and lack of restrictions. Which is an indirect call out at Steam, which hasn't cared in the slightest and continues to have a worse policy.