I don’t use GOG. I’m not going to let them treat me as a second class citizen, when Steam treats me as first class.
One of these two entities actually lets me own my games. To where I can install them from local files even without an internet connection. One of these entities leases me games that I can install with an internet connection as long as they see fit. They are not the same.
Learning that steam may delist a game if its offered by another store for cheaper has definitely soured my opinion of them. GOG should make a native installer though.