It's always listed in the same spot on all the store page for games. Now why they haven't allowed us to filter games by DRM (like they have f2p) is another question. I'd love if they allowed this and published stats because I like most people assume I'm in the majority and would love to see that you're cutting off access to X% of your market if you include rootkits/aggressive drm.

Only additional third-party DRM is listed there, not Steam's own DRM.