The poll says grim not grimdark.
Grim and Dark are two different things.
Grim means you likely won't succeed. And if you do, you don't affect much. And either way, you are damaged. Grim
You can succeed in dark fantasy. You can be a big hero in dark fantasy. The world is just a level of gross or terrible.
You can have a grim realism but in a nice and appealing world. If you cannot change the world.. if you won't succeed in your quest... it's grim. Many cyberpunk worlds are grim but not exactly dark.