Personally I'm getting tired of being verbally assured an agreement doesn't mean what it says or that they'll never use it that way. If that's really the case then what's so hard about adding a written clause stipulating the usage?
One argument I've heard is that the person isn't authorized to make changes to the agreement. This was in the case of a recruiter for a large firm, so I could sort of see that, but then we go back to my original point that legal agreements often shaft the consumer with no recourse beyond "don't use their service". If their service happens to be the only good high-speed internet provider in the area and your line of work requires a high-speed internet connection then the only way "don't use their service" becomes feasible is if you change your career or move. For something that's becoming a staple like electricity or water that's hard to argue as a justified response.