1) Nearly all spam is blocked by spam filters. Why does sending spam continue to be so popular?
Email spam is considerably cheap in cost compared to other forms of advertising.
2) What characteristics of the Internet make the censorship of Internet content difficult?
It is not centralized, and access changes from location to location. It is hard to limit access from a specific geological location as the use of proxies and other means still allow access. Shutting down and censoring information takes time, and in most cases after one site is shut down another replaces it.
3) What physiological reason has been given for the difficulty some people experience detaching
Heavy uses or digital devices crave newness. Every text, email etc results in a release of the neurotransmitter dopamine that feeds the craving.
4) What is the Enlightenment view regarding responsibility for addiction?
People are responsible for the choices they make.
The addict is responsible for choosing to engage in the activity the first time. People are capable of controlling their compulsions
all the best