I am making a group called the Unlisted Games Protection Group (or UGP), where me and a couple members aim to preserve games that are either old, or no longer for sale. through us, you can download and play these games that are at risk of being forgotten, and we will provide the necessary tools to play them for you.
As of now we aren't big by any means, nor do we have many games yet, but we are rapidly growing our library, and taking suggestions!
Source: https://www.reddit.com/r/oldgames/comments/v9mvm7/for_the_protection_of_all_old_or_unlisted_games/