im new to the stock market game, but why werent they flagging these stocks as volatile when they were growing like crazy? It wasnt until after they realized what was going on at GME. then people went at AMC the same way. then everything changed. Just all of a sudden stopping people from buying a stock they bought hours before is not illegal?Firms have plenty of stocks on restricted lists. It's not illegal. When I was at UBS they wouldn't let anyone buy Canopy Growth or any other company involved in cannabis (except SMG). Highly volatile stocks always get tightened margin requirements or are marked as non-marginable. Nothing about this is out of the ordinary other than the boiler room antics of r/WallStreetBets.