I have seen things like that on other exchanges that I use and even on the old exchanges that I see, I often see things like that on yobit, the daily volume used to be really high
and if there was anything, it was less than $100, after a few months you would be surprised that someone pumped coins and then the volume suddenly increased the price.
It is clear that the developer of yobit himself is probably doing that to entice traders who think that the price on the platform will increase significantly
but suddenly pull back in a short period of time.
Because those places allowed manipulation as a pump and dump, and that is why Binance is the best one because that is rare on binance and they try to limit it as much as they can. Obviously some people would go over it and do a better job than the defensive system, so even on Binance you can see it time to time, but it's not common and rarely happens. We should consider how to make these worse places try to use the same defense, instead of letting it happen for more money.
When there is a pump and dump, some manipulation, that means trading, they trade to manipulate, and when they trade, they leave trading fee, which makes money for the exchange. This is why many exchanges allow it to happen and that's a bad thing to have for an exchange but more money so they accept it and let it happen.