This is the major issue with cryptos. One drawback for investors who are interested in investing in cryptocurrency, is the confusion about its legal status. Because these cryptocurrencies are unregulated, terrorists and extortionists are also using this as an opportunity for them. There are many incidents of scams including what exactly your story depicts, clarifying that it’s difficult to track illegal activities in cryptos. My opinion is that, the investors shouldn’t lose hope and just be cautious and explorative, which can definitely help prevent being scammed.