-I think It is popular. many people accept and trade in Bitcoin because It is recognized and accepted as a currency by many.
-Bitcoin is decentralized and limited. This is a major factor for many Bitcoin users. Bitcoin is hard for governments to trace and tax
-Bitcoin acts like an equity investment. The market value of Bitcoins has had wild swings in value and even a market cap.
-Bitcoin is a social network. The Bitcoin "community" is active and acts like other online social networks.
-There are only 21 million bits so it has the same value as gold.
The value of anything is determined by its usefulness, in all fields, forms and purposes. In the economy, cryptocurrency works mainly in the digital market in transactions and investment trades. It is very valuable because it gathers people to form a community and an industry full of different jobs from mining to campaigns and investing.