I dont know how this is a big thing, yes crypto currencies are used for bad things as well as for good things. It is the same with FIAT, FIAT is used way more for laundering and bad things. Yu dont see news articles stating '' FIAT was used for such and such crime'' but for crypto it is suddenly big news, besides crypto is easier to trace so it is even better that criminals use crypto over fiat, they can be found more easily.