Robert Kiyosaki, the author of 'Rich Dad Poor Dad,' has issued a warning against fiat currencies, labeling them as 'fake money.' He advocates for Bitcoin, Ethereum, gold, and silver as more reliable alternatives. Kiyosaki highlights Bitcoin's fixed supply of 21 million as a significant factor in its investment appeal. Additionally, he criticizes inflation for disproportionately affecting the poor and middle class and condemns rent control policies in U.S. cities as detrimental to property owners and reflective of Marxist economic ideologies.