Anyone notice attempt to manipulate?

I suppose everyone has noticed, at close of market, and at the open, how some "being" (if we can call them that...) try to manipulate the SP ....

Today was very clear how the BUY side and the SELL side were being manipulated. ... then both the buy and sell get withdrawn at the last second .... What are these "robots" trying to achieve?

Isn't anyone watching these kind of manouvers?

Makes a mockery of the entire share market.