The Robin Hood regime

It has become apparent to me in the last month that there has been a massive transfer of wealth from the gigantic hedge funds running factor models to many day-traders with accounts less than $10M. I call this the Robin Hood regime ( regime being a common technical term referring to a particular trading environment, as in "this is a mean-reverting regime "). Many, many day-traders that I heard from have had one of their best months in a long while. Is this just luck, or is there a deeper explana