1) That's a click-through EULA.
Click-through EULAs haven't been universally struck down in court yet.
Anyway, with my understanding of copyright law, the fact of the matter is that the copyright holder has a certain set of exclusive rights. Unless the copyright holder expressly gives you permission (eg. under a license agreement), nobody but the copyright holder is authorized to exercise these rights. Namely:
* To reproduce the work in copies or phonorecords;
* To prepare derivative works based upon the work;
* To distribute copies or phonorecords of the work to the public by sale or other transfer of ownership, or by rental, lease, or lending;
* To publicly perform the work, in the case of literary, musical, dramatic, and choreographic works, pantomimes, and motion pictures and other audiovisual works;
* To publicly display the work, in the case of literary, musical, dramatic, and choreographic works, pantomimes, and pictorial, graphic, or sculptural works, including the individual images of a motion picture or other audiovisual work.
It's the second exclusive right (creating a modified derivitave based on the original) that is potentially being infringed by jailbreaking. If it were to be proved in court that jailbreaking did, in fact, involve creating a derivitave work, then it would be criminal.