In the case of Darksiders 3, THQ Nordic and Gunfire Games have been actively working to prevent cheating and maintain a fair gaming environment. As a result, they have patched the Fling trainer, rendering it ineffective.
If you are encountering issues where your trainer appears "patched" or non-functional, it is likely due to a version mismatch between your game (Steam, Epic, or GOG) and the standalone trainer file you are using. darksiders 3 trainer fling patched