Pumps on illiquid assets are almost every day. Such assets are easy to pump. But these pumps 1-2 times a day. I remember that in times of market growth, sometimes more than ten assets made + +100% per day.
Then we need to rejoice with you that at least some movement occurs on the trading platforms. After all, traders could also sit and wait, as investors do.
Some traders do it. They specialize in the trading of pump&dump. It is very easy to find out where the price of a pumped asset will go. I also learned this strategy. The difficulty is that most small tokens and coins cannot be sold in shorts.