This means the rules governing your investments and legal rights can change without your explicit re-consent, and simply keeping your account open counts as agreeing to whatever new terms Robinhood introduces.
This agreement significantly limits your legal recourse by requiring all disputes with Robinhood to be resolved through FINRA arbitration and waiving your right to participate in class action lawsuits. Robinhood retains the right to liquidate your investment positions without prior notice if margin requirements are not met, which can result in sudden and potentially significant financial losses. You can opt out of the arbitration clause by sending written notice to Robinhood within 30 days of account opening, as specified in the agreement.