Citation, please. You keep stating that the infrastructure was paid for by taxpayer dollars, and that's not entirely true. Tax incentives were involved in many things, sure, but we incentivize people to buy houses (and health insurance) through the tax code and I doubt you'd make the argument that "all your houses are belong to us".
No citation needed. I like that strawman you did there. But in actuality our taxes most certainly do go towards the expansion of communication. On everyone's bill there's actually a tax specifically for that purpose. That's at the federal level. At the State and Local they receive lock-in agreements and further tax incentives. Now do our taxes finance it entirely? Unlikely. But then again no one is saying that.
The Internet is one of the most publically financed things next to the NASA program itself. Just about every country on planet Earth subsidizes the Internet in some way.
BTW in many States much of the land under a home isn't owned entirely by the homeowner. Water, Gas and Mineral rights are usually purchased separately from the State or local municipality. Depending on the State you lived in I could drill underneath your home and as long as I didn't affect your health there isn't' too much you could do to stop me. At the federal level it can also confiscate land. If it can prove that taking land you pay for is for the greater good of the entire country as a whole it can take it from you. Good luck taking the U.S Federal Government to court. You better be really rich and have more lawyers than OJ Simpson.