It seems to be for the regular Coinbase account (not pro), and gives you zero fees for $30 a month..
I am not a Coinbase user, but I thought Coinbase Pro and Coinbase.com has been merged. I checked Coinbase pro on Coinmarketcap and it is now named Coinbase exchange.
HUOBI with small margin both ways and zero trade fees was like exchange paradise..
Are you sure there is zero trading fee on Huobi? It was not so the last time I checked. Only the exchange I know that have zero trading fee is Binance.US, but maybe some other exchanges have it too.
Binance has now some 0 fees with no monthly fee either (for their 5 years anniversary), but I don't know how long will it last.
I don't like it exactly for the opportunities this gives to those who want to manipulate the market (wash trading, fake volumes, you know the drill).
I saw when CZ proposed zero trading fee on Twitter, which means it was supported by the community, yet wash trading or something like that was talked about which some traders can use to manipulate the market.