Countless video games, even if they're announced and shown to the public, are eventually cancelled and never see the light of day. It's far more common for a promising idea to run into any number of a million problems—fatal design issues, lack of funding, you name it—and join the legions of video games that are left half-finished on a random hard drive.
This is a companion discussion topic for the original entry at https://www.vice.com/en_us/article/k7q9qy/most-games-dont-take-seven-years-to-finish-heres-why-gunsport-did