Some games on our platform prefer to use content curation for the mods available in game. This can be for a variety of reasons, such as console restrictions, a preference for controlling the content available in game, or any other number of reasons.
Ultimately this is a game team decision, and not something controlled by mod.io.
Your best bet in this situation is to reach out to the game's community management team directly. You can usually find their contact information by clicking the Game Info button on their mod.io page (it looks like a lower-case 'i') or by searching [game name] support using a search engine of your choosing.