"And understand that scarce spectrum is used today for example for cell phone operators, they have to pay for the airwaves they use, for their services"

This quote by Robert McChesney is referring to the limited accessibility of spectrum, or the airwaves utilized for interaction services. Spectrum is a finite resource, and as such, it is becoming increasingly limited. Mobile phone operators, for instance, should spend for the spectrum they utilize to supply their services. This is since the spectrum is a valuable commodity, and the need for it is growing. As the need for spectrum increases, the expense of using it likewise increases. This is why mobile phone operators need to spend for the spectrum they utilize. The quote is emphasizing the importance of comprehending the scarcity of spectrum and the requirement to spend for its usage. It is likewise highlighting the fact that spectrum is an important resource that must be handled thoroughly.