Coinbase collects fees. Even if the spread is minimal (I think Bitcoin goes to something silly like 8 decimals but even for a book in USD, the bid/ask spread may be 39 842.54 vs 39 482.55, so a spread of one cent), Coinbase still takes a fee on every trade. And they take a fee from both the buyer and the seller.
I'm not sure their business is related to spreads.
Coinbase collects fees. Even if the spread is minimal (I think Bitcoin goes to something silly like 8 decimals but even for a book in USD, the bid/ask spread may be 39 842.54 vs 39 482.55, so a spread of one cent), Coinbase still takes a fee on every trade. And they take a fee from both the buyer and the seller.
I'm not sure their business is related to spreads.