I do think that! The due diligence you're describing is only necessary because the custodians can actually improperly handle the money. Embezzlement is a real thing in the traditional system.
Give smart contracts a few more years, and you're going to be more skeptical of the existing system of due diligence with custodians (which we know can be abused) when compared provably secure smart contracts (which we know can have bugs, but will eventually be stable).
If you think crypto is all a Ponzi scheme, you probably haven't been following it for the last couple of years.
Also if you think the traditional system is not a Ponzi scheme, you probably don't understand how it works.