Exactly. I have a RH account with zero margin and was not able to even look at GME in the RH app (i.e. not even see a chart – didn't show up in the search resul

Exactly. I have a RH account with zero margin and was not able to even look at GME in the RH app (i.e. not even see a chart – didn't show up in the search results at all). People who already owned shares were able to sell, but nothing else.