This project does not sound like it is about simple ISP service, since in this case the buildings are already supplied with wholesale ISP service. I assume that a big piece of this project is the intended cost savings over the otherwise likely monopolistic ISP service. Do you think even wealthy US residents would not benefit from potential cost savings and potential improved service?
Not to mention that I suspect a healthy percentage of US buildings to not have ISP service. Unless you live in a metropolis, most buildings in the US likely house lower income families. But, even a small percentage would still be a very large number of individuals that could benefit.