Word has it that Mastercard’s purge on online gambling accounts has been a vast manual operation.
The payments are actually being intercepted, so players are not notified by MasterCard that the operator has not received the funds. The player is then billed, while the payment processor offering MasterCard on behalf of the online casino is fined.
It’s all explained in the linked article, but it does pose the question: why? Why would they take such trouble to weed out so many customers? Have they been promised some sort of exclusivity once online gambling is legalized and regulated in the US, per chance? Read more.