Sam Bankman-Fried has previously said "I would never read a book" and prefers blog posts.
But since he's been under house arrest, SBF has written over 1,000 pages, the FT reported.
Bankman-Fried passes his time writing and speaking to his lawyers, the paper said.
Last September, in an interview with Sequoia Capital, a major investor in FTX, Bankman-Fried said he was skeptical of books as a concept, saying: "I would never read a book."
"I think, if you wrote a book, you fucked up, and it should have been a six-paragraph blog post," he added.