They pointed me to an obscure page on their site that implies but doesn't directly say that this might happen. I don't know the laws, have to do more research.
You don't need to be an expert in the rules and try to determine on your own whether it's a violation of FINRA's rules. FINRA will do that for you.
Even if Robinhood technically disclosed that they might do it, violating a customer's express orders without documenting appropriate reasons for doing so is generally a violation of FINRA's rules. Brokers have lost their licenses for shenanigans like that.
