Eh, most people can do without 100% of the internet, but they don't want to. And why should they? It's easy to opt out of ads - just don't use sites that have them. But if person A wants to watch some ads in exchange of "just" entertainment (which is downplaying the importance of entertainment, but whatever), why should that bother me?

Assuming of course that person A is fully aware of what they are giving said ad company, which currently is often not the case.