Robinhood Chain's trailing 7-day revenue annualizes to ~$589M.
That drops it right next to prediction markets ($624M) and above equities trading ($516M).
HOOD discloses 13 business lines over $100M ARR.
You should never annualize seven days. But Chain retains ~90% of the fees it generates. On operating income it's a far higher-margin line than anything else on this chart.