Robotic "manipulation"?

Greetings all,


Having posed the following questions some time back, and having received no real clarity then , I thought they were worth asking again ~ epecially in  light of our current situation.

1. Why are bots allowed to buy one share  per trade, when we punters have to put up $500 min  ( before commission )?
   
2. What valid reason can there be for such rapid-fire trades~ particularly in the last seconds before close of trading?

3. If~as I believe~ this behaviour is intentionally manipulative, is it legal?

4. If  it is illegal, why do you believe the ASX does not investigate?

Thanks in advance for any insights.

Cheers,
Pat