This is how the game is rigged.
Robinhood put restrictions on MUX and AG(FirstMajestic)....and ANY other stock identified on WSBs as one with high short interest. The BUY limit on MUX was 5 shares ....you can sell as much as you want....just cannot buy more than 5 shares. F.M(AG,,) was 1 share. That's Why it opened up ,50% and dwindled over the day because the buying dried up. https://robinhood.com/us/en/support/articles/changes-due-to-recent-market-volatility/