I have never seen examples of criminals often using bitcoin for criminal purposes. I think they were just fakes. Now, when the popularity of cryptocurrencies has sharply decreased, these fakes do not make sense and they are no longer supported and distributed.
criminals transact using bitcoin is a stupid thing, because every transaction is recorded on the blockchain, it becomes very transparent, do criminals want to do something like that? using an issue like this might only aim to block the rate of bitcoin and to drop the value of bitcoin, but we can see the rate of bitcoin where it can't be blocked, let alone stop,