Oh. Erhm... This is _not_ about software piracy. Lemme reread the rules shortly... Okay. As far as I can see, the word 'hacks' is used in the board rules only where software piracy or actual hacking (of other people's computers) is involved.
One could argue that this lets you actually use an OS you haven't got a license for, but I guess that's not the case, since by using Classic you're using it all the same. Also, the software is _provided_ by Apple, you're only using it a different and unintended way.
Also: I haven't yet heard reviews of the 'hack' (no positives, no negatives) so far, and I guess it's 'Macintosh News' and people have been discussing this very subject ever since Steve Jobs said that hardware sold in 2003 wouldn't boot OS 9.
and I smell funny
The interesting bit, as I see it, is that this clearly shows that it has nothing to do with hardware support. Yes, you won't find drivers for AirPort Extreme or FireWire 800 under OS 9, maybe, but basically, these Macs are still Macs - Apple hasn't gotten rid of any legacy hardware/software that would prevent the machines from booting Nine.