If Bank C is forced to take the loss, it'll be more careful in opening accounts for scammers to withdraw money. If Bank C is in a country that doesn't care to enforce such losses, then Bank B (or A if A is big enough) will think twice about deciding to do business with Bank B. Moving the cost of the scams onto the banks will strongly incentivize them to prevent the scams.
There's some kind of circular reasoning going on here.
Banks are more careful, and that's why they don't deal with certain kinds of transactions. And that's where crypto comes in to "disrupt banks" and "democratize finance".
Long term, crypto will be no different than regular currency and finance because people don't like getting ripped off and defrauded. We'll have a period of time with people pulling old scams but with crypto, and eventually it'll be regulated just like normal finance.
The problem is that crypto is designed to evade regulation. You can put lipstick on a pig and regulate the centralized intermediaries (which, remember, crypto aimed to disintermediate): exchanges, custodians, ETF providers, ...
The dilemma is that you can either escape those regulations by going to unhosted wallets (self-custody) and transacting on the blockchain, or you keep everything (by regulation) entirely within the regulated intermediaries, but then there's no need to waste 1% of world electricity on some slow "decentralized" database.
How is it designed so? You pass a law that puts anyone running a node 10 years in prison and anyone accepting or paying through it as well. You see, easy.
For this to not be possible it would have to be widely in use and government-backed.
> Moving the cost of the scams onto the banks will strongly incentivize them to prevent the scams.
And then less people have bank accounts.
The scammer isn't necessarily the person with the final bank account. Its often somebody who was told they're managing payroll for some made-up company and they're going to get a 2k transfer and to keep 500 of it and withdrawal 1.5k of it as cash to do payroll.
While you may think that now only people who aren't scammers won't get bank accounts what actually is happening is that anybody that can be fooled doesn't get one.
https://www.bitsaboutmoney.com/archive/optimal-amount-of-fra...
Doesn't that already happen? I've read stories from people in the US who are fooled, and as such, are marked as high risk and have their accounts closed. The rate it happens might be greater, but the total increase in harm from fewer people having bank accounts due to risk of scams might be less than the harm reduced by fewer people getting scammed. If scams are reduced enough, the number of people having bank accounts might go up because less people are losing them after being scammed.