Every manufactured metal has alloys added to it. To my knowledge there are few manufactured metals, if any, that are used by man that are used in their pure form. All steels we use have alloys, there's just no getting around that. Alloys are what make steel hard or soft, bendy or springy, rust-free (stainless) or high carbon. Aluminum, magnesium, titanium, beryllium, copper all have alloys or other metals or compounds added to them to reach the desired working state.

The term "alloy" as used in the bicycle industry as previously stated refers to aluminum. Here's an analogy: do you blow your nose in a Kleenex or a facial tissue? A Kleenex, right? Well, if you want an "alloy" bike yer gonna get an aluminum bike. I here what you're saying and it isn't "wrong" but I wouldn't cry into a facial tissue over it...er Kleenex.