Maybe a better idea is to offer it only to those areas of the country where a person can only get something LESS than broadband coverage where they live. But again, who is going to pay for the 'free' part and how will any percentage be applied?
I would hope it wouldn't be like the electrical tax here in MA. During the Great Depression the northeastern states were attached with an additional tax to help pay for the TVA in Tennessee. It has never been repealed and we still pay it. It's hidden now under a general federal tax applied to all electrical bills here.
Like I've stated before: The Democrats have never seen a tax they didn't like.