AML, or anti money laundering, is the set of checks and controls a gambling operator must run to stop gambling being used to move criminal funds.
AML rules are why a large deposit or an unusual pattern of play triggers questions about where the money came from. They are a licence condition in every regulated market, so an operator that skips them loses its licence.
A player deposits 8,000 euro in a week. The operator sends a source of funds request and asks for a recent bank statement or payslip showing where the money came from. Play continues, but the withdrawal is held until the document is reviewed.
No. The check is the operator legal obligation and the operator pays for it. A request to send money before a withdrawal is released is advance fee fraud.
That is a source of funds request. It is a standard AML step after a large or unusual deposit and the operator is required to make it.