Seriously. The only "DRM" steam has is needing the steam client open, which is by no means a bad thing. You don't even need to be connected to the internet.
That's why I can't start my games when a huge patch goes out or a new huge game comes out? (Even if they are paused)
what's that?
Steam has offline mode?!
Steam Offline mode is weird and doesn't always work.
I find if I haven't opened up Steam before my internet goes out (If I boot my computer up after my internet has gone out.) it doesn't work.
Even then though what I'm pointing out is the fact that even a slight DRM causes a lot of people to go "KELP IMMA PRIVATEN THAT" even if they won't ever have a problem with it, then they will proceed to turn around and use Steam.