I don't think this is about the potential worst that can happen.
My guess:
Apple is betting that the tablet is the future of the PC. Apple is also betting that hardware prices will crater like the PC did. The future is about services and less about hardware and the iPad will get cheaper over time. Apple wants to guarantee their 30% cut on publishers, devs, etc. while making it difficult to port it over to other platforms.
I think it's wrong in believing this may have to do with lawyers. I think this is Apple's intent so they can close up any potential loopholes that would give a competitor an equal ground. Apple may not have to do this anyway since Android will probably not be the favored OS to use in education but Apple wants the guarantee.
My guess:
Apple is betting that the tablet is the future of the PC. Apple is also betting that hardware prices will crater like the PC did. The future is about services and less about hardware and the iPad will get cheaper over time. Apple wants to guarantee their 30% cut on publishers, devs, etc. while making it difficult to port it over to other platforms.
I think it's wrong in believing this may have to do with lawyers. I think this is Apple's intent so they can close up any potential loopholes that would give a competitor an equal ground. Apple may not have to do this anyway since Android will probably not be the favored OS to use in education but Apple wants the guarantee.