That, and piggybacking on our backs. The other (all of them) tradesites funding their services by taking smallish fees (0.2%) create a spread on their orderbooks, caused by that fee. It doesn't make any sense to trade on a high frequency and paying a fee ... on a high frequency. Just paying 100x 0.2% a minute are like ... do the math (my brain hurts!) should look like radioactive decay line on trade portfolio. Exponential
Effectively blocking out any HFT approaches.
But... if one exchange plays defect and offers Zerofees, all other tradesites are creating an opportunity for HFTs on that site.
Guess who pays that bill.
We have to decide for what we want.