The short version: no spam, ever.
CableSense collects as little information as possible and uses it as rarely as possible. In practice, “little” usually means “none” and “rarely” usually means “never.”
For the sake of full disclosure, I should mention that the web server logs basic information about your computer, such as your IP address and the name of your web browser. Such logging is standard procedure across the Internet, however, and I have no idea how to turn it off. Needless to say, it gets ignored.