It is important to distinguish cheating from legitimate graphics settings. Many players use as their primary renderer because it offers better performance and stability on modern hardware compared to "Software" or "D3D" modes. Using the -gl launch option is a standard way to ensure the game runs at its best without being a cheat.
Unlike "Internal" cheats that might lag a weak PC, OpenGL hacks were lightweight because they simply changed how the GPU drew existing information.
Creating a post about an OpenGL wallhack for Counter-Strike 1.6
