If you were in my shoe, what would you've told a person that says bitcoin is a ponzi scheme created to scam people?
Tell them that Bitcoin is
Digital Socialism.That usually stops 'em in their tracks.
Digital socialism? It is exactly the opposite.
Bitcoin is insurance against socialism. Socialism means you don't own your life or the products of your life, an evil and immoral philosophy if there ever was one. Remember the goal of socialism is communism, and any form of authoritarianism (fascism, socialism, communism etc) wants to own you and your life with you having no recourse to someone else enslaving you.