I also would ever use Robinhood instead of a reputable broker like TD Fidelity Vanguard IB etc. But not for the reasons you stipulated. Back office systems aren't put in place to "fleece" anyone.
Back office systems are exactly where Citadel, the market maker, could put a tiny little window to peep at data they shouldn't, so they can frontrun every trade retail investors make!!
The secret ingredient is crime ;)