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themazingness: It would be cool if I'm wrong, but I don't see GoG accommodating a Steam key. They are in direct competition, unlike say Itch.io which had little competition so some devs have Steam keys with purchase.

I think you're more likely to see success via Atari or Digital Eclipse themselves. Either way, I'd like to know the outcome.
Regarding your point about 'competition' between Steam and GOG, if the developer accommodated a key.

Steam provides keys to developers as a free service. The profits of these keys goes 100% to the developer:

https://partner.steamgames.com/doc/features/keys
What I think gog should do regarding this situation is add this game to the preservation program considering these are old Atari titles and commandeer the game. Update it themselves. Take the files Atari and Digital Eclipse uploaded to steam and add them to the gog version by force. A "You refuse to update the game yourselves Atari/Digital Eclipse so we(gog) will do it for you to keep the game up to date.