Earlier quoted context omitted.
Depends on what your "salary" is. In the EU, the banks are obligated to find out where you get your money. And they have an obligation to close your account if they don't get satisfactory answers. "Know your customer". My bank has recently started to ask customers to clarify transfers, and even shoot and send some video of themselves, smiling, and explaining things. I haven't got that myself yet but several colleague…
This is what puzzles me. Why they need an explanation how money flows in their own system? Don't they see all transfers?
Series of transfers are a basic step in money laundering processes, so from that point of view the need for clarification of each step is understandable.