Governments around the world have taken various actions against cryptocurrencies in recent years. Some of the most common actions include:

1. Banning cryptocurrencies
Some countries, such as China and India, have banned cryptocurrencies altogether. This means that individuals and businesses are not allowed to buy, sell, or use cryptocurrencies within the country.

2. Regulating cryptocurrencies
Other countries have chosen to regulate cryptocurrencies by requiring exchanges to register with the government and comply with certain rules and regulations. This is the case in the United States, where the government has taken a regulatory approach to cryptocurrencies.

3. Taxing cryptocurrencies
Governments have also started to tax cryptocurrencies, treating them as assets rather than currencies. This means that individuals and businesses must pay taxes on any gains they make from buying and selling cryptocurrencies.

4. Investigating cryptocurrencies
Governments have launched investigations into cryptocurrencies to crack down on illegal activities such as money laundering and terrorism financing. This has led to the arrest of several individuals involved in such activities.

5. Warning against cryptocurrencies
Some governments have issued warnings to their citizens about the risks associated with investing in cryptocurrencies. They caution that cryptocurrencies are highly volatile and can result in significant financial losses.

Overall, governments' actions against cryptocurrencies have been mixed. While some countries have outright banned cryptocurrencies, others have chosen to regulate them or tax them. The legality of cryptocurrencies varies greatly from country to country, and investors should be aware of the laws and regulations in their respective countries before investing in cryptocurrencies.