Maybe Matt Levine?

He'd probably charge too much

has Matt Levine previously sacrificed his entire life for the cause of truth and justice?

No, but unlike Snowden, Matt Levine isn't stupid. Remember, Snowden thought that PRISM was an illegal government surveillance program that let the NSA look at anybody's internet communications. This was not supported by the documents Snowden leaked and, completely unsurprisingly, turned out to be false.

The organizers of this presentation probably thought that Snowden could be similarly duped here, and many of his fans are conspiracy theorists who bought Greenwald's reporting without asking the obvious questions it raised, so they would be easy marks. More recently, Ryan Cohen applied the same idea by selling NFTs to GameStop's cargo cult investors waiting for a MOASS that will never come. You would have to be bonkers to think you could pull the wool over Levine's eyes on a financial scheme, and even if you were to pay him enough to look the other way, his readers aren't the type who would fall for a crypto-scam.