This is called the influence of celebrities or influencers, one tweet is enough to raise the coin by 300%, this gives the project more than its fair value. I know the Travala coin (AVA) project, it is somewhat old since 2018 and the value of the coin was low during those years but now it has risen because of one tweet.
Anyway, the project is good in terms of the idea, but I do not know what they really have, if there is no continuous development and actual use of the coin on the ground, it will end like the rest of the failed projects.