It was mentioned in one of their previous interviews as reason to parner with gog. I’ve unfortunately not bookmarked it, though, and I’m too lazy to search for it, sry.
edit: found it: “At the very least, GOG is sure that its support for Fallout: London won’t upset Bethesda,“They’re also our partners so we wouldn’t want to do anything to harm our relationship.””
It was mentioned in one of their previous interviews as reason to parner with gog. I’ve unfortunately not bookmarked it, though, and I’m too lazy to search for it, sry.
edit: found it: “At the very least, GOG is sure that its support for Fallout: London won’t upset Bethesda,“They’re also our partners so we wouldn’t want to do anything to harm our relationship.””
in https://www.thegamer.com/fallout-london-gog-release-delay-fallout-4-update-interview/