Fairly certain the execs will instruct the cashiers to demand clients to transfer out the stock, and may even force client accounts to acat the entire account. And since no firm will prolly not accept an acat transfer with that stock, firms will liquidate everything and close the account as most firms don't do partial acats any further.
I don't understand why stupid people buy scam stocks and risk their financial lives. These actions are flagged by the FRB, I would not want to be in the FRB database. Actually, they are not flagged, the person/entity is reported to, and hww do I know, I did it every day for years.