i think its ridiculous to think that RH accounts are moving the market. RH account size avg 1K to 5K indicating that even 1 million accounts wont have the effect of 1 smaller size institution.
I do buy in to the theory that it can have a marginal effect due to some corps buying the info and frontrunning the trades. However the large companies dont need the info as trade data is automatically fed thru the supercomputers (another topic if its ethical/legal).
on the other hand, once these institutions decide to sell the drop will be quick and RHs will be deep in the red. Even stop losses will be almost useless in this scenario.