So Coinbase is a casino. How can a casino lose money when they take the house's not so small cut all the time? Is it ran by Trump or something?
My guess is that most crypto brokers lend the money out to bad investments (fractional reserve banking, here we go) and lose money that way.
Both of these statements are incorrect. You can read about their business in their EDGAR filings. Should be an eye opener for ya.

Yeah net income at the June earnings was -1B, that is a billion lost in a quarter. But wait, what about the March earnings? They only lost -430 MM, so that is better.
A casino/broker should make money in both an up AND down market. Not only make money when the crypto prices are going up. Should be an eye opener for you.