Gersen: You can start the game without Galaxy, it's just that the shortcut created automatically try to launch Galaxy but if you launch the game from the EXE located in the install folder it will run without it.
Also there are two different type of installers that you can download, some with Galaxy and some without (look at your downloaded files if there is a (g) at the end it means it's the ones with Galaxy.) the ones with Galaxy bundled install it by default (you can change that during install).
If you want to download the Galaxy-less installer, on the download page click one "MORE" and select "Classic installers"
even if it did require Galaxy, it would still not be DRM. dependencies are not DRM, if it was then a game needing Java, or DirectX or Windows DRM.
DRM is still digital RIGHTS MANAGEMENT