Am I missing something here... is Coinbase goes down, then their customers can't sell... or are you basically saying that the disruption to the across-exchange green candles is enough to make people on other exchanges sell?

I totally understand that Coinbase has had 4 years to work out their infrastructure, and it does look suss as hell, but from a server infrastructure point of view, it is hard to maintain integrity when there are huge sudden spikes in interest. It's not super cost effective to run x10 the server capacity you normally need, even with cloud infrastructure... but still, these outages are absolutely killing their reputation.