With Citadel as a large market maker I would think Robinhood likely has a financial conflict of interest with them with respect to their customers, selling Citadel "dumb flow" (and now, depending on how you look at it, lobotomizing the flow).

It's a different Citadel, from here: https://www.theverge.com/22251427/reddit-gamestop-stock-shor...

At least one Wall Street firm has taken heavy losses — Melvin Capital Management, which was shorting GameStop, among other bets. It’s been bailed out by Citadel, which, confusingly, is not the same thing as Citadel Securities. (Citadel is a hedge fund, not a market maker.)

It's a ""different"" Citadel only in the twisted sort of logic lawyers are hated for. They're operated by the same people and have the same name.

It's the same Citadel, just different legal entities.