This article describes components of illegal online activities that have recently emerged and expanded. The paper starts with defining basic terms (e.g., FinTech, Crypto, Dark Web) and explains corresponding regulatory issues. Then, the author develops how these elements work together to allow illegal activities to take place on the Internet, along with specific examples (e.g., PayPal, API, insider trading). The report concludes that the rise of cryptocurrencies (FinTech) deteriorates the stability of the existing financial system and calls for immediate actions, proposing some specific countermeasures.