The Consumer Protection Act of 2019 codified celebrity endorsement liability into law. It requires celebrity endorsers to conduct sufficient due diligence to ensure that their endorsements are not misleading or unsubstantiated.
So, based on the contents of their endorsements, Larry David is probably in the clear (since he explicitly did not endorse FTX). OTOH, Tom Brady's ads stated that FTX was the "most trusted" and "most trustworthy" institution in crypto, so he appears to be screwed. And for a $30 million payday, he could definitely have afforded to conduct even a modicrum of due diligence.
Famously, Taylor Swift was approached about and endorsement and offered 9 figures...but turned it down after her team did due diligence.
Other celebrities endorsing other crypto scams have pled guilty and paid fines under this law, such as Kim Kardashian, Jake Paul, Soulja Boy, etc.