Coinbase says its problem days are over. Better Business Bureau disagrees.

They've changed. They promise. 
To hear the San Francisco-based cryptocurrency exchange Coinbase tell it, they've turned over a new leaf. Sure, SEC documents revealed scores of customer complaints against them — ranging from allegations of fraud to negligence — but those were in the (very recent) past. These days, insists the company in a series of blog posts and statements to Mashable, Coinbase is a different animal.
But over the course of 2018 its customers have deluged the Be