Imagine one as a gate keeper and one as a patrol. In one you need to get past the gate keeper. In the other you need to be constantly vigilant everywhere becaus

Imagine one as a gate keeper and one as a patrol. In one you need to get past the gate keeper. In the other you need to be constantly vigilant everywhere because the code is fully DRM integrated. Games that utilize internet connectivity for DRM only can simply fake the internet connection. On Steam, this is done by tricking the copy of the game that the .dlls and relevant Steam .exe are running and everything is in order. Comparatively trivial to do, and these games are cracked very quickly. However, games like Simpsons Tapped Out, Sim City, etc. go a step further and prevent you from playing without an internet connection. This means that instead of just needing to fool the game initially and cruise from there, you can't just surgically remove the DRM. It's too integrated into the back-end code. The only solution is to fake a server. Much more difficult.