The risk I think you're saying is: if we charge a company with a stolen bank account and pay in bitcoin, it's irreversible. That's true. We're mitigating this — that's why there's an ACH chargeback period that we wait out. And why we verify bank account ownership before charging. These are standard KYC rules that we have to comply with before accepting a company on payroll, and charging bank accounts is all done on the company side. I hear that they might fail, but we're not allowing anyone to run payroll and pay out in high volumes (eg. 80+%) of BTC to start with until they've been manually verified.
We've checked this through our lawyers and via Fincen, and we're mitigating risks every way we can.