It's very hard for the itch.io to automatically detect when an mmorpg, or any other project doesn't work. The best you can hope for is someone using the report button.
Viewing post in Remove MMORPG games that no longer work
Personally I don't think it matters as long as the moderators become aware of it. That being said, it only makes sense to do so if it actually violates a rule. And if it does not I would also like to hear from admins or moderators what their opinion is on the subject. After all, wouldn't a cleaner result list benefit everyone?