Yup. These guys aren't joking and certainly not interested to bother with low class traders resulting in more stress than actual profits.
ItBit won't even look at you if you don't bring at least $100,000 to the table as OTC client. We can't see how much OTC volume they generate, but I'm pretty sure that a business with their background and respect is generating more OTC volumes than all spot exchanges combined when it concerns BTC/USD(T) trades.
Just look through the on-chain transactions, lol. There is some hardcore trading going on where tens of millions move from one party to the other. In the last 24 hours $5.5 billion worth of on-chain transaction activity, which is insane. https://bitinfocharts.com/bitcoin/