Audyssey is not Harman's competitor. Audyssey is in business of licensing room correction technology. Harman is a manufacturer and doesn't license their technology to anyone. Besides, the information gained from the comparison, especially when it comes to what factors are important to listener preference, is something that any room correction manufacturer, including Audyssey, can take advantage of (for free).
Exactly. When subjected to double-blind testing, it turned out that the sound people craved (listener preference) was not as complicated as many folks originally assumed. Of course, delivering that sound to multiple seats is a different story.