The DRM filter shows every type of DRM available on the HS, so yes, it does. The DRM-free option is there for that exact reason. To show that a version is available that is free of them all.

In GOGs case, not as a DRM option. It's an oxymoron to say "DRM: GOG"

If you buy Retro City Rampage at the Humble Store you can choose between a GOG and a Steam key IIRC.

No, that's Humble Widget (https://www.humblebundle.com/store/product/retrocityrampagegog), not Humble Store (https://www.humblebundle.com/store/p/retrocityrampage_storefront)

Ah ok, thanks for the clarification.

Then again, not all games on Steam are DRM'd, and even if Humble only has a Steam key (as is the case for some games there), I wouldn't be surprised if some of those were actully DRM-free (effectively using Steam just as a downloader).

Can we not compound the matter farther? If we are arguing about the filter being called DRM filter or somesuch, then call it a platform/keys filter and be done with it. If it shows GOG, it redeems on GOG, if it shows Desura, it redeems on Desura, if it shows Steam, it redeems on Steam and if it shows DRM-Free, it's directly available from Humble.

That'd be the best solution as far as I'm concerned.