This kind of shady insider trading is something you can find a lot of especially in exchanges which offer derivative trading. Its all a bunch of horseshit. People do not really understand the scam which is high leverage liquidation. If you want to short your coin just swap it for USDT. Now you're shorting at 1x without any liquidation point. Better, right?
Hope Coinbase gets what it deserves.
Is it actually Coinbase that will be getting something it deserves? I believe that it is three employees who were abusing their positions, not coinbase itself. Anyway, it certainly is an abuse of trust of the customers who those employees are supposed to be serving and abuse of the trust that their employer placed in them. Whether it is criminal is a different issue due to the nature of some of the coins, it is certainly wrong no matter what though.
I agree with you about centralized exchanges and trading, it is a recipe for just these kinds of shenanigans.