I imagine it was even more frustrating for the eavesdroppers when they could no longer listen in on the top secret discussions with your grandparents. The eavesdroppers will not give up easily though; grandparents everywhere must stay vigilant.
Some people have prominent positions or intend to do important things in their life and they don't want to see personal conversations being leaked under the threat of blackmail.
This is a tired trope and it's time we put it to rest. There is nothing wrong with software not intended for a "mass market".