Is there somewhere that explains reasons why a specific game might not exist on the site?

There is a AA/AAA game that released a few months ago that I'm surprised isn't on the site and I don't understand why. I can't find any references to it on the site at all. It has been long enough since release that I don't expect there to be a run embargo or whatever it's called. There are games from the same dev & publisher that are on the site. Can someone explain how this works?

Thanks!