I don't know exactly when it started, but I suspect Apple has used this domain for at least a few days now. Whether that's as far back as Mountain Lion's release, or as recently as iTunes 10.7.

Considering some of our active theories, it may have only started becoming used as a result of that Terms & Conditions snafu that occurred the other day.

Either way, the problem predates my registration of the domain, which was around 13 hours ago now. I registered bogusapple.com as a result of seeing use of the domain.