My comment also states that since adblockers have come along a DNS solution seems a bit archaic. Adblockers are even more slick and user friendly so your reply doesn’t at all answer, why? Why move back to a less than solution?

Lack of device control, unknown alternatives, unwillingness to just say no (for whatever reason… not criticizing here) seems to be the answer.

Unfortunately, as ignoramous states there are techniques that will render DNS blacklisting useless if they want to.