1) This thread is literally about IBKR, and you're ranting about your baby RH?

OK, I will still answer this ridiculous statement. So let's say RH loses 10% of their customers (or product, like you like to say), do you think they still get the same revenue from selling their flow to Citadel and such? I will leave this question for you to chew on.
2) I agree that the risk was there, but there are clear signs of hyper herding and unbelievable stupidity in it now, hence the risks are exponential.
3) they don't have much to sell if their customers blow up either.
And lastly, my favorite statement of yours where you placed the negative crude prices into 1985, I don't think I have anything to add. I wasn't even born then, I'm still in Uni.