Personally I favor Bitcoin over Bitcoin Cash, but Bitcoin Cash does not qualify as a "scam". It is a competitor.
I would normally agree with this, but I would argue that calling Bitcoin Cash just Bitcoin, which is what they want to do, is pretty scammy in itself. Legit competitors would want to distinguish themselves, not take over a name. Google never claimed to be Yahoo.
That being said, why would Coinbase delist Bitcoin Cash? Everyone should be able to choose which coins they wish to use, even the ones whose vision we don't agree with. Anything less than that is censorship.
Perfectly said all coins are shown as altcoin to bitcoin then why not use bitcoin cash and coinbase have rights to list coin of their choice where ever they will see the profit they will list coins