In a line of poetry, an iamb is a foot or beat consisting of an unstressed syllable followed by a stressed syllable, or a short syllable followed by a long syllable. For example, deLIGHT, the SUN, forLORN, one DAY, reLEASE. ... This line has five feet, so it's written in pentameter.
Its influenced by becoming a part of social media, been made into emojis, a victory dance, mentioned in movies and whatsoever.
Its been successful as its easy to learn, its catchy, its been widely used and gone viral, plus originated from a very famous game.
It became popular due to the reasons mentioned in the above answer.
Viral dances are seen as a way of uniting everyone, as they all know it due its popularity, its used for entertainment purposes and advertisement.
They definetely provide enetertainment as their popularity reaches movies, games and dance videos which people watch. Cultural statement to an extent as whether the dance came from a specific culture or a platform, such as gamers first discovered the floss