Yeah, Steam requires DRM (I can't say I blame them), but if you're a die-hard anti-DRM person, you'll be able to download a copy of your DRM-free version directly from HareBrainedSchemes (which you then can upload to PirateBay or whatever Warez site strikes your fancy).
But the DRM-free version is only getting the first update- after that, it's abandonware, and the DRM-ed version will get new tilesets, options, and characters, as well as extensions of the campaign. I'm going to support the DRM version, not because I care about rights management, but because I think HBS deserves their nickel, and I want to enjoy the extra content that they can come up with (like the matrix stuff).
- kv