https://battlepenguin.com/tech/the-american-banking-system-i...
To be fair, in Australia all I needed to transfer money was your name and account number and it'd appear within 24 hours. Since I've left, I've heard the system is more real time, with funds showing up in seconds.
You can pull money from accounts the same way in Australia, but I suspect it's limited by business and there are audits in place to stop and reverse fraud.
https://qry5s.sse.codesandbox.io/
Any name Any email address Test account number: DE89370400440532013000
I would imagine the situation in the US to be quite similar.
It would be harder to get back if they did it to your business account and you didn’t notice.
See for example, Clarkson: https://www.theguardian.com/money/2008/jan/07/personalfinanc...