With the caveat that I'm approximately as crypto-skeptical as they come, (a) the interview snippet in that video sounds like SBF describing how a hypothetical could work, not his actual business - though it's hard to tell with all the interruptions from the host yelling "Ponzi!"; (b) the interview snippet in the video doesn't even obviously sound like a Ponzi scheme, but more like an exploration of collective actions and collective beliefs, which is...not unrelated to how regular money works?