After reading about this, I’m convinced that it’s mostly marketing.
He’s supposed to return the money in 2022. If he doesn’t, I’ll be convinced that this wasn’t just a marketing stunt after he thought up an alternative.
He thought up a fun way to play with this concept of being handed so much in cash… the museum then went along with this idea.
The resulting publicity, and that fact that the money is supposed to be returned… really seems like brilliant marketing.