In what way is it unethical for a company who is providing me a valuable service to also give me the opportunity to opt-in to seeing ads to support that service

In what way is it unethical for a company who is providing me a valuable service to also give me the opportunity to opt-in to seeing ads to support that service? And in what way is it unethical for that same company to provide the service, which I desire, of blocking ads that I've already decided I don't want to see, because the people serving me those ads are violating my privacy? Many people seem fixated on trying to frame this in the most disparaging way possible, which distracts from the reality of what is actually happening here.