I am not defending anyone nor do I know any details, but I do know the rules. If a brokerage firm issues a margin call to someone they have two choices: Come up with more assets or if not, the brokerage can liquidate your position(s). and the brokerage can choose to liquidate what they want to to meet that margin call. The customer can not dictate.
What I can't tell for sure is whether or not all RH accts are margin accts. If someone upgrades to a "Goldh account" does that mean it's not a margin account?
Here are there three accounts:
Robinhood Instant
When you sign up for a new account, you’ll automatically start with a Robinhood Instant account, which is a margin account. This means you’ll have access to
instant deposits and extended-hours trading. You also won’t have to wait for your
funds to process when you sell stocks or make a deposit (up to $1,000).
Robinhood Gold
A
Robinhood Gold account is like a Robinhood Instant account, but gives you access to more buying power and larger instant deposits.
Robinhood Cash
A Robinhood Cash account allows you to place commission-free trades during the standard and extended-hours trading sessions. You won’t have access to instant deposits or instant settlements. You can
downgrade to a Cash account from an Instant or Gold account at anytime.