Steam has DRM (the games are tied to Steam IIRC so if your account ever gets deleted you're fucked), so I don't know what you mean by "solved the DRM issue".
I pointed out the same thing elsewhere in this thread. Steam didn't solve the DRM issue (it still has it) and it didn't solve the "piracy" issue (you can still pirate Steam games by ripping their DRM).
It solved the "lost sales" issue, by making it so extremely convenient to buy games legally that anyone who can afford to just isn't going to bother pirating stuff.
I pointed out the same thing elsewhere in this thread. Steam didn't solve the DRM issue (it still has it) and it didn't solve the "piracy" issue (you can still pirate Steam games by ripping their DRM).
It solved the "lost sales" issue, by making it so extremely convenient to buy games legally that anyone who can afford to just isn't going to bother pirating stuff.