My local bank started doing overdraft protection by opt in. The deadline to opt-in is, coincidentally, tomorrow.
They started doing opt-in because of government regulation. Chase was hounding my ass for months with phone calls (voice mail) and email (trash) until finally a personal banker cornered me to try and get me to opt in, I finally had to politely rephrase "fuck off". If the government didn't force this on banks you would have found you had already "opted in" by default.