I'm surprised this discussion is allowed. Lying about having bought a PC in the past few months in order to reduce the cost of a W8 upgrade is no different than asking for pirated copies of the software.
If MS Thinks I pirated my 15 dollar copy then they can call and ask me since I put my phone & address into the tool.. But I am fairly sure I wont be hearing a thing about it & neither will anyone else so I would be willing to wager that MS does not believe this is pirating..