http://fortune.com/2017/07/31/bitcoin-fork-coinbase/
The world's most popular digital currency exchange, Coinbase, is under fire from angry customers over its decision not to support a new version of bitcoin that could also make it vulnerable to "ruinous legal trouble," according to a prominent legal scholar.
Coinbase's headaches are tied to a breakaway faction of bitcoin miners, who are responsible both for generating new coins and for the software called blockchain that is used to record transactions. On August 1, the miners will implement a software update that will create a so-called "fork" and result in two versions of the bitcoin blockchain—and two forms of the currency as well.
The creation of the new currency means every existing bitcoin holder is entitled to an equal amount of what the breakaway miners call "Bitcoin Cash." Coinbase's decision against supporting the new version, however, means its customers will not receive this benefit.
This is significant because the new Bitcoin Cash is expected to be worth real money. As of July 31, futures markets predict a unit of the new currency will be worth hundreds of dollars.
This has led customers to post angry messages on Coinbase message boards, accusing the company of stealing their property and threatening class action lawsuits.
Such a lawsuit may not be far-fetched, according to Tim Wu, a prominent legal scholar who writes extensively about technology. In a series of tweets, he likened Coinbase's decision to a broker withholding shares from its customers.
I dont see anyway how Coinbase will be held liable in this kind of action because I believe they would have issued a statement in that regards concerning their position for not supporting the BCC and no client of them can force them to offer the services they are not offering. You owe it as a responsibility to yourself to move your coin out of sites not supporting BCC before the fork because you have been notified and no one should be held responsible for your inactions. But from recent news, it seems they are caving in.