FUDster is an individual who intentionally spreads FUD. FUD is any piece of information that would create negative feelings, including fear, uncertainty, and doubt amongst the investors. It is the activity of spreading negative information about cryptocurrencies. A FUDster can be a rival or a group of investors who can have a significant impact on the value of cryptocurrencies.

FUD can largely affect the decisions of investors. Whenever the crypto market seems to go down, FUDster spreads misleading information, worsening the situation. Over the years, FUD has resulted in tension and fear in the market.