The big US banks each make over $1.5B in overdraft fees yearly. Fees on consumer accounts make up about 3-4% of the big banks annual income. Not as much as they make on consumer interest payments, but those are still some pretty big peanuts. I think they'd feel it if they scrapped fees.

https://money.cnn.com/2017/02/22/investing/atm-overdraft-fee...

https://www.depositaccounts.com/blog/banks-income-fees.html