I think it's a bit disingenuous to blame Steam for a decision Rockstar made. The final decision lies with the publisher as to what game actually ships. If they want to remove their old listings and replace them with a worse offering, that's on them.
GOG can't do this because (nearly all) of the hosted games have stand-alone installers that users can archive themselves. AFAIU that's not possible with Steam.
paulryanrogers|3 months ago