> Ray said that “one of the most pervasive failures” at FTX’s main international exchange was the lack of records about decision-making. He said that Bankman-Fried often used messaging platforms with an auto-delete function “and encouraged employees to do the same.”

https://arstechnica.com/tech-policy/2022/11/new-ftx-chief-sl...

("Snapchat" - the specific brand - may be inaccurate. I've seen it reported as messages that "auto-delete" without a specific platform mentioned.)

I heard they used Signal, which can have disappearing messages