You as a seller will never know the method a buyer selects to pay you, so if another option is added this is good news for you as it gives that option to a buyer who may not have been able to buy from you beforehand.
They pay Klarna in instalments, you receive the full amount.
PayPal also have a system for a buyer to pay PP in instalments, you receive the full amount.
@our_time_will_come