Now meme tokens are very popular because they allow earning even more money than buying other coins and tokens. A lot of people pays attention to meme coins because it is funny and profitable, like this https://twitter.com/defidotoken/status/1438810085636116482
Meme coins are actively promoted, that is why they are so popular. Many people buy meme tokens hoping for future growth in price.
Promotion is necessary for all projects not only for meme coins. Now meme coins usually are used only for speculations.