Steamworks is not really intrusive,.
Non intrusive DRM is worse than intrusive one, since it's more sneaky and users tend not to pay attention. Same way hidden snooping camera is worse than public surveillance. Here is a thread which discuses it at length: http://forums.cdprojektred.com/threads/16563-What-does-DRM-achieve-and-does-piracy-equal-lost-sales
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Stuff like Steamworks, that at most comes with an encrypted executable if even that, is completely harmless for me.
Both because I don't mind using the Steam client anyway (in fact it's more or less my default way to keep in contact with my gaming friends) and because at least keeps "teh DRM" limited to the game files, without putting garbage that does gods-only-know what in background.
How do you know what else Steamworks can do in background? Who audited it to be harmless? DRM is always some black box code, and trusting it is a questionable attitude. From security standpoint it should never be trusted, since by its very definition DRM is deployed by someone who doesn't trust you. And trust depends on mutuality. I.e. the same way DRM doesn't trust you (assuming you are a potential criminal by default), you should symmetrically assume it's malware by default.
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