While Tom Brady, Shaquille O'Neal, Giselle Bündchen, Larry David and other celebrity promoters are currently being sued over their endorsement of failed cryptocurrency exchange FTX, Taylor Swift isn't among them - because she was the only celebrity to ask whether NFTs were unregistered securities, according to the lawyer handling a class-action lawsuit against the other celebs.

During an appearance on "The Scoop" podcast, attorney Adam Moskowitz said the plaintiffs are seeking more than $5 billion from the celebrity endorsers, who he says didn't do their due diligence to determine whether the crypto exchange was breaking the law.

"The one person I found that did that was Taylor Swift," said Moskowitz, who added that FTX wanted Swift to sell concert tickets as NFTs - which Swift questioned.

"In our discovery, Taylor Swift actually asked them: 'Can you tell me that these are not unregistered securities?'" said Moskowitz.

Swift's father notably used to work for Merrill Lynch.

According to the Financial Times, Swift began discussing the $100 million sponsorship in the fall of 2021. FTX would implode one year later, after concerns over commingling customer funds led to a stampede of withdrawals.

The class-actioon lawsuit accuses celebrities of promoting an unregistered security - which, when sold in the United States, must be registered with the SEC. In a December complaint, the SEC said that the company's cryptocurrency, FTT, was classified as a security because it was sold as an investment contract, yet was not appropriately registered.

"In order to induce confidence and to drive consumers to invest in what was ultimately a Ponzi scheme," the defendants "made numerous misrepresentations and omissions," according to the lawsuit.