Comparison to toll-free means...
It's a little-known fact that when you call an toll-free number, the company that is paying for that number gets your callerID - whether or not you are hiding it. The argument is that they are "paying for your call, so they should know who is calling them."
This would seem to be the same thing - they are paying for your connection, so they should get data about that connection... What data, though, is a question I cannot answer...