As long as profits are greater than fines, these penalties aren't enough to incentivize good behavior.
Sooooooo the fine is nearly 2x the cost to consumers due to malfeasance. That should cover your concern here.
So Robinhood took money from its customers to this extent: all the cash as if its customers were paying commissions, and also $34M, and for that they're being fined $65M, which will probably be negotiated down to $2M or something like that.