Yes, fud is very much done by people who do not want to spend a lot of capital in investments, for example, Peter has 50 digital coins, let's call it a "dummy coin", dummy coins are a new coin that potentially has a high price because bountynya project success. Then someone appears, let's say he is steven, he speaks to the peter that the coin held by the peter is a coin that is not good (whether it's a scam or something else), whereas actually the coin held by the peter is a good coin. As a result of the action of the steven, eventually the peter became disbelieved again with his coin, and then the steven bid the coin with a very cheap price and then the peter agreed that the coin will be purchased by the steven.