Many people do both credit card business and POS business, because many people will have the need to handle POS machines after making credit cards. And if the two businesses do it together, the income will be better. As long as the POS machine is sent out, as long as others want to swipe their cards, there will be gains.

It is not illegal to buy and sell pos machines, but it is illegal to cash out maliciously and should be investigated by law. Providing criminal tools and dealing in illegal products will also be punished by law.