The fine print and terms of agreement will always bind you. Commercial entities are charged differently than residential services. Much of this derives from Copyright agreements, not so much from the service providers but from the services from which they buy from. Also a rental such as housing is considered a commercial operation. Just about all municipalities will differentiate their rate structures for utilities as will insurance companies.
With respect to the modem question post, I would advise the renter and the owner to tread carefully. You don't want to violate "theft of services" regulations.
We all would like to think that cable tv channels are free to the service provider and early on they were, but now they aren't - I've reviewed contract language from programmers like ABC, NBC, CBS, ESPN, and it isn't cheap or pretty to the cable firm. I'm sure many of us have had to consent to agreements to utilize free software and we seem to sign our great grandchildren away.
I am just advising to err on the side of playing by the rules - however unfair they seem to be.