Because people who design video games love to play video games . People who design office software look forward to doing something else on the weekend. These are marketing terms, referring to packages set up for reasons that have nothing to do with conceptual sense or the user's good. 0. Actually these are half-lies. They describe the computer world as it is, but not as it can and should be.
All human artifacts are technology.
But beware anybody who uses this term. This is actually almost always a political move. Somebody wants you to give certain things to them to design and decide. Perhaps you should, but perhaps not. I believe the principal issues of media design are vital for tomorrow's understanding, freedom and survival, and should be a matter for public understanding and debate, not merely the decisions of the XML committee, corporate startups or Ph.D. candidates trying to do flashy new stuff, or glitzy fund-raisers.