Imho games that are no longer available from any source should probably stay in the database, but maybe be moved to an area for defunct games if that's possible. There may be instances, now or in the future, where this database will be the only record that a particular game ever existed. Of course if games and/or other programs are no longer available from their developers, but are present at the Audiogame Archive, those links should be provided. But in my opinion, if a game is truly lost to time, either because it's entirely server-based and the only server(s) are gone and there is no possibility of new servers, or there simply aren't any known copies extant, the game should remain, but be marked in some way as unavailable, possibly in some cases with a request that if anybody does have the game, please contact so and so.