Robert Kiyosaki may be one of the most vocal advocates of Bitcoin (CRYPTO: BTC), gold and silver—but even he warned on Saturday that they can be risky if you buy them "on hype" instead of doing your due diligence.

Kiyosaki Critiques Bonds…Again Kiyosaki, author of the best-selling book "Rich Dad Poor Dad," took to X to reiterate his long-held skepticism about the safety of U.S. bonds.

"Don't drink financial planners Kool- Aide when they tell you U.S. bonds are safe.

There is nothing safe….from stupidity," the world-renowned author said.

Kiyosaki noted that even gold, silver, and Bitcoin can "cost you money if purchased on hype." China, Japan Dumping US Treasuries?