At least now we can't be accused of stealing it. (Even though most people bought a copy of the previous versions) But I suppose that still doesn't address the EULA.
Yeah, but they can now tie the legalities down to a couple things:
1. Free Mavericks = only with new Macs. Since you can't buy the OS now and since a Hackintosh is not Apple-branded hardware, per the EULA there is no ground to stand on.
2. They now control the A to Z of hardware; in particular, this is bad for the video card system. While I'd imagine they'll continue using a generic base driver (i.e. Intel, Nvidia, AMD), they could, in theory, sow up the driver system to lock in only what they support in the future. Not that it wouldn't be hackable, but the Mac Pro was the last truly expandable system; now it's a garbage can with single-bay video cards. The 6GB Quadro 6000 is a 2-bay piece of hardware, so upgrades will be very limited going forward because of the size & power limitations.
Not that this will stop creative people from circumventing the systems they may or may not put in place, but it definitely opens up some interesting new possibilities for Apple legally & technically. And I get the feeling that, at some point, they are going to make the transition to ARM-style chips that they can build in-house. For now, Intel is keeping up with ULV CPU's, multi-core desktop processors, etc., but Apple keeps getting smaller & smaller (Mac Pro trash can, thin iMac, tiny Mac Mini). I wouldn't be surprised to see Apple offer their own version of the NUC, either.
Even if the hardware was less expensive, I still think I'd have a hard time letting go of my DIY bug. I'm sitting here working on my wife's iMac with an i7 Ivy Bridge, SSD boot drive, a bunch of 2TB & 4TB drives, built-in card reader, great GPU that I can switch out in the future, DVD burner with Lightscribe, yada yada yada, all in a nice, compact little Antec VSK3000 case. Hard to want to go to a Mac Pro, pay thousands, not be able to upgrade as easily, and have to go external for the data drives, optical drive, and card reader.