iTunes "knew" you by your iCloud ID, called Apple ID then I think. As to how it worked, no idea. It just worked.
I'm curious - what consumer-facing software costs $3k? I mean today, not in 1985.
Also, nobody disputes that such licenses "exist." If SU didn't choose this path we wouldn't be discussing!
The irony here is that the previous advanced Audssey product, the iOS App, has a best-of-both-worlds license: you can use it on multiple Audyssey-equipped devices AND it's portable as you upgrade your phone hardware. Frankly from what I’ve seen so far it’s the better product, too. This one seems to forsake modern features such as fitting the response to a target curve in favor of basic PEQ. (The miniDSP equivalent, BTW, is 10x10HD not DDRC-88). I guess some people like that. I don’t. This one also does not improve bass management either from what I could see, which is a huge disappointment as IMO Audyssey lags behind DLBC, ARC Genesis, and RoomPerfect there.
Ahem. See one of my posts above. OK, I think both of those were technically “CSL Calibrated Dayton EMM-6 into Focusrite interface” measurements, but close enough.
Bottom line is surveys show that the included mic allows Audyssey to fit the in room response of good speakers to their chosen target curve within the measured area.*
*I intentionally make no effort to sample the measurement points. I take samples within the same measured area. If the system is worth a damn it should provide stable results at any random set of control points within the measured area.
While I think it makes sense from a marketing perspective to let people use fancier mics, the audible benefit is likely just that you stop hearing people talk about the issue.