Much of the game’s logic and its core appeal—persistent multiplayer and the Workshop—rely on official server authentication. A crack can bypass the initial license check, but it cannot easily spoof the complex server-side handshake required for a stable experience.
If you are looking to "create features" or modify the game, the official tools are the most effective way to do so without the risks of malware or broken game files found in unofficial cracks. Official Ways to "Create Features" and Content arma reforger crack updated