The strength of Steam lies with the fact that Valve has created a service that people want to connect (and authenticate) with, and tying all your games together

The strength of Steam lies with the fact that Valve has created a service that people want to connect (and authenticate) with, and tying all your games together makes it a real loss if your account is banned. Obviously online games are hard to crack on Steam (it was developed for Counterstrike). However, single-player games are as easy to crack on Steam as any other DRM system. All you need is a dummy account and a crack not to have to authenticate online.