Fear, uncertainty, and doubt (often shortened to FUD) is a propaganda tactic used in sales, marketing, public relations, politics, polling and cults. FUD is generally a strategy to influence perception by disseminating negative and dubious or false information and a manifestation of the appeal to fear.
The crypto community’s sentiments swing like a yo-yo from time to time, causing prices to rise or drop. FUD in cryptocurrency is a psychology trick used to spread doubt and fear which would cause that certain coin to drop in price.
By spreading questionable information about the drawbacks of less well-known technologies, an established company or government can discourage decision-makers from choosing those technologies over their own, regardless of the relative merits.