You mean the answering machine didn't take off until after the wars and great depression ended, suburban life started becoming the default for large groups of people, and they were starting to be away from home for long periods of time, and that before then it saw only limited use by the fairly small numbers of people who were away from their home for long periods of time?

Well now I'm convinced. Guess I better buy tickets to El Salvador because clearly crypto is going to the mooooon.