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I thought the real value of Robinhood was that it was a substantial source of information about retail traders for its parent company.

Robinhood doesn't have a parent company?

I think what was meant is "Robinhood the app's parent company, also named Robinhood"?

Given the tone I suspect the person meant "Citadel". Which is a view I don't endorse, but see often.

Well you better go read some contemporary history then, because Ken Griffin has some luggage with Robinhood's name on it.

Retail orders are valuable precisely because they don't contain much information