I have feelinmg that on cryptopia there are bots on some market pairs. Am I coorect? the orders automatically change, cannot happen so fast so many orders
Sure they are there. any big exchange has them. They are providing liquidity and make markets move a bit time to time. in many cases there are multiple bots trading on one coin pair (+arbing its crosspairs). many traders use bots with different strategies, so the bots themselves often compete with each other.
But i dont use them, because i have no idea how to make a trading bot or set one up.

imo crypto market is not much different compared to other markets like forex, stocks, futures etc in this regard. Only difference is, that in crypto, small players have much more power than in large financial markets' instruments trading.