Coinbase stole $30,000 from me and won't return it.
They listed a new coin (bitcoin cash) without prior announcement. I bought $30,000 worth at $5000 each. It went from $500 to $9000 in a matter of minutes. However, while allowing people to buy the coin at very high prices, they also froze everyone's ability to sell the coin. They only allowed people to sell it on their market again, about 24 hours later, after the coin went down to $1,000.
They say that coinbase engineers knew about the coin being listed beforehand (obviously) and bought a bunch before listing it publicly (an unannounced), then the insiders sold it all for a huge profit.
What lesson did I learn? Coinbase is crooked.
Oh well. Lock 'em up