Betrayal at Krondor had limited 'free release', it was once hosted on Sierra's website, but the EULA said you could download it freely, but not redistribute it. It could only freely be downloaded as long as Sierra hosted it.
So there are some interesting exceptions there. That may have been the case with SS1 as well.
Speaking of which I wonder what the restrictions if any are on Johnny Castaway screensaver? It was also hosted free on Sierra years ago, but not sure if it had the same redistribution restrictions as BAK.
There were also a few companies that released some special promotional release of games modded to give 'advertising' (ad popups and such) that were 'free' from short time, until they were taken down.
http://en.wikipedia.org/wiki/List_of_commercial_video_games_released_as_freeware Games no longer freely distributed
The following are commercial games that were re-released as freeware but were not freely redistributable software. They were only available as freeware for a limited time, but could not be redistributed, so they are no longer freely available.
Airborne Ranger (1988), a stealth 2D game by Microprose. It was released as freeware by Atari to promote Airborne Rangers. A free registration was required to download the game. After Airborne Rangers wasn't released, the Airborne Ranger page and the download link were removed. The game is still mentioned as freeware and many forums and sites have the now dead link to the game page. The legal situation now is unclear because the installer has no disclaimer.
Area 51 (2005), a first person shooter by Midway Games. Its free release was sponsored by the US Air Force. It later changed hands and its freeware status was removed.[96]
B-17 Flying Fortress (1992), a flight simulator by MicroProse.[97]
Betrayal at Krondor (1993), a role-playing game by Dynamix.[97]
Caesar (1992), a city-building game by Sierra.[97]
Duke Nukem 3D: Atomic Edition, free at GOG.com for 2012 Holidays.[98]
Fallout (1997), a role-playing game by Interplay Entertainment, free on GOG.com for two days.
Far Cry (2004), first-person shooter video game developed by Crytek. Ubisoft had released the game in a four-day promotion as ad-supported freeware on FilePlanet.
Gateway (1992), an adventure game by Legend Entertainment.
Hollywood Monsters (1997), an adventure game by Péndulo Studios, for a month to promote the release of another Pendulo title, New York Crimes.[99]
Patrician III: Rise of the Hanse (2003), a strategy game by Ascaron and FX Interactive, for two weeks to promote the FX Classics Store.[100][101]
Portal (2007), an action/puzzle game by Valve Corporation, available from May 12, 2010, for two weeks to promote the Steam client's availability to Mac users, and once again for a few days in September 2011, to promote the "Learn with Portals" initiative.[102]
Prince of Persia: The Sands of Time (2003), third-person action adventure video game developed by Ubisoft Montreal. Ubisoft released the game as ad-supported freeware on FilePlanet for a limited time.[103]
Rayman Raving Rabbids (2006), a video game in the popular Rayman series, developed by Ubisoft Montpellier. Ubisoft had released the PC version of the game in a four-day promotion as ad-supported freeware on FilePlanet.
Realms of Arkania 1+2, free in GOG.com completing a survey.[104]
Realms of Arkania 3, free in GOG.com taking a download quality test.[105]
Red Baron 3D (1998), a flight game by Sierra.[97]
Rise and Fall: Civilizations at War (2006), a real-time strategy/third-person shooter by Stainless Steel Studios and Midway Games. Re-released as ad-supported freeware, sponsored by the US Air Force.[106]
Runaway (2001), an adventure game by Pendulo Studios and published by Dinamic Multimedia, and later by FX Interactive. The game was released for free for 30 days to celebrate the launch of Hollywood Monsters 2, a.k.a. The Next BIG Thing.[107][108]
The Suffering (2004), a horror third/first person shooter developed by Surreal Software and published by Midway Games. It was released free in September 2008, but is no longer available due to a new copyright holder.[109]
Tom Clancy's Ghost Recon (2001), a tactical shooter by Ubisoft. Released in an ad-supported free download version in 2007 for a limited time; available to US residents only.[110]
Zork I, Zork II, Zork III, text adventure games by Infocom.[97]