Yobit accepts every shitcoin if they pay enough. They also tend to credit their users with a lot of Bitcoin shitforks. And that's why people keep using and holding their coins with them even after all the shady stuff they have done.

Coinbase will only support legit coins with a potential future.

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Not every shitcoin can show at Coinbase. https://www.gdax.com/static/digital-asset-framework-2017-11.pdf