El Salvador became the first country to use Bitcoin as legal tender on September 18, 2021, a decision that sparked global attention and controversy. However, the value and potential of Bitcoin as a cryptocurrency remain in doubt.

First, bitcoin's high volatility in value and price makes it less widely accepted as a stable investment option. While many investors see bitcoin as a leader in the digital currency space of the future, its practical application and impact will take time to prove.

Secondly, there are also some issues with Bitcoin's security and reliability. Although Bitcoin's blockchain technology can provide greater security, its algorithms and system design can still have vulnerabilities or flaws, which can lead to data loss or theft.

In addition, El Salvador faced many challenges when introducing bitcoin as legal tender, including monetary policy making, regulatory involvement, consumer education, and many other aspects. Therefore, while implementing bitcoin policy, the government also needs to take a series of measures to ensure its security and stability.

Overall, El Salvador's decision to adopt bitcoin as a legal tender is a controversial one, with policy risks and market factors to consider, as well as technical and legal difficulties to be resolved. Nonetheless, El Salvador's move also provides a reference for other countries to think about how to use cryptocurrencies as a means of payment and drive change in the financial system.