There are numerous reasons why a coin/token with no use case value experiences a price pump in the market. One reason I believe is a tactic to attract attention to a coin or token in the market. When a coin/token pumps, it grabs the attention of many, and instead of spending on advertising through other means, they use their funds to pump their token/coin in the market. This is just my analysis, and I'm not claiming it to be the sole reason. However, if there's advice here, it's that you shouldn't jump in just because of the hype, ensure you're confident and conduct thorough research before investing in a pumping coin with no use case value.