You guys are wrong. They removed it from the terms because you can by NON valve games and get banned for textures. You will get banned for using them. They removed the Textures from the NON ban list because they didn't want customers thinking that all games were safe to use textures. Only Valve games are allowed to modified texture wise. Modern Warfare 2 didn't ban textures because 1. they didn't try to or 2. they never said they weren't allowed. Treyarch may ban you from there servers without Valves Permission.
Source : steam forum.