I do not think that something can be expected from other exchanges after one exchange has reduced a fee. This is absolutely unprofitable because this is the main earnings of the exchanges is a fee, a decrease of a fee to zero will greatly reduce income
If they does not reduce the fees for teh traders obviously the people who give the lesser fee than them will be capture the trading volume on their platform.
We just need focus on the good exchange also at the same time because the users are looking for good exchange first and then they want to have the fee also as a matter of it.