> but I think, with traditional money exchange the reliance is on regulatory and legal enforcement, rather than making the technology itself watertight,
A lot of money and research has gone into this, and the tech is being tightened up all the time.
> which increases the risk profile, and thus cost.
Except the cost isn't actually higher.
> You can do this in traditional approaches because you just pass on these costs and there's no need to improve beyond what people are willing to pay.
In the US perhaps, not in places where these costs are regulated.
> Crypto represents...
A much more expensive and more risky way to do basically anything, because you have neither solved security nor trust problems, you've just moved them.