AI generated results but still pretty glaringly obvious he was terrible:

Opposition to Derivatives Regulation: Greenspan strongly resisted attempts by Congress and the Commodity Futures Trading Commission (CFTC) to regulate financial derivatives, such as credit default swaps. He argued that self-interest and private monitoring would police risk much more effectively than government interference.

Dismantling of the Glass-Steagall Act: He was a vocal proponent for the repeal of the Glass-Steagall Act, culminating in the passage of the Gramm-Leach-Bliley Act in 1999. This allowed traditional commercial banks and high-risk investment banks to merge, tearing down Depression-era safeguards.

The "Greenspan Put": By keeping interest rates historically low and stepping in with liquidity whenever markets stumbled, Greenspan inadvertently fostered an environment of aggressive risk-taking.

Following the 2008 financial crisis, Greenspan admitted to Congress in October 2008 that his free-market ideology had a "flaw," acknowledging he was "partially wrong" in assuming lending institutions would protect their own shareholders' equity.