Companies/businesses do not like people poking around in their infrastructure without permission to do so .... plain and simple.
Here in Canada, a graduate student in a large university was working on an app that would allow students to get their schedules and updates/revisions right on their smartphones, and while developing this app, he uncovered a MAJOR vulnerability in the school's network.
He immediately took his findings to the school, and instead of thanking him for this, he found himself expelled from the school, for a breech of the technology agreement that he signed when he started to attend the school six years prior.
Another similar story:
http://news.nationalpost.com/2013/01...personal-data/