The most obvious and recent example of this would be cryptocurrencies. Cryptocurrencies enable the citizens of a country to undermine government authority by circumventing capital controls imposed by it. It also facilitates nefarious activities by helping criminals evade detection. Finally, by removing intermediaries, cryptocurrencies can potentially throw a wrench in the existing financial infrastructure system and destabilize it. With the inception of cryptocurrencies, the government loses control over the currency system due to decentralization. Most cryptocurrency system's underlying technology does not allow any central authority for any transaction and this means the government cannot regulate the monetary policy and loses power to control the economy. Accordingly, many countries and economies do not like cryptocurrencies.
Social media would be one more example. In totalitarian regimes, controlling the traditional media is paramount to maintaining power and control over what their populace sees and understands. Social media however, provides multiple networks for people to experience a huge variety of opinions, many of which will be contrary to the regime in question.
