[notfbi]

The 34 million calculation is only for "certain" orders. I think this means some trades would be advantageous under the RH model (small trades where a $5 fixed commission would overwhelm any percentage), some trades would be disadvantageous under the RH model (very large value trades), and they only summed the comparative fees on the disadvantageous trades.

This might make sense: if users were knowledgeable and had multiple brokers, they may execute at the better trade-specific broker for each trade, so adding up just the potential bads gives some perspective. But on the other hand, it's not a perfect indicator for Robinhood's net gain as its omitting trades where Robinhood's structure leads to lower commission.