Earlier quoted context omitted.
Suppose we two make a "smart contract": I say I pay 100k, you say you sell me a functional car. Let's say you then deliver a broken car. Now what? How can't we have disputes, we did a "smart contract"?
You and I can agree on an independent 3rd party as a notary. If within a six months of the sale both you and the notary sign off that the deal was not fulfilled (the car is junk), you get the $100k back. That means I can’t spend the $100k directly for six months. But, I can easily take out a six month loan against it. That way it’s liquid for me and still safe for you. The loan agent is taking on the risk in exchange…
If the answer is “corrupt third world countries” ask yourself why the demand is driven by affluent Americans trying to sell things, and how effective “but it’ll go down on your permanent record! In a different country!” will be when the local capo’s buddy tells the notary the car was fine when you bought it.