They all have them. Coinbase/binance/bittrex etc all have API's for this sort of thing just like hive engine and splinterlands and even many stock brokerage firms. Usually they add much needed liquidity to the market but in this case they end up just being a nuisance the way they are programmed.

If you log into a major like coinbase pro and watch btc trade, that's 99% bots trading and something like 90% of all stock trading is also bots. The good ones even monitor the news which is why every time china bans crypto every single coin falls off a cliff still all at once.