To those that don't understand the 0% trading fee, he's talking about it as part of their marketing and promotion. It would take a week or up to a month to have this type of promo and IIRC there's also an exchange that did this and its just a matter of days, that exchange gained a lot of traders.
It was launched early this first quarter of the year but I barely remember what's that exchange was.
This is what I meant also in that it's not enough to attract people. 0 fee that lasts for a short while, even a few months, is not worth the time to move over funds into a new exchange, where the liquidity is not so high and coins are few. By the time coins are listed and liquidity is high, the 0 fee is over and then you end up with just the same costs as on another exchange.
So in the end, it's marketing, but can't be sustainable
It's hard to maintain this type of promo if the exchange gathered tons of traders and their volume is increasing. They are looking to their profits and they can't prevent the motion of their traders, it may not be worth to move most of your funds but if its a chance of doing so, trying is okay with.
But if ever there will be an exchange that will be charging no fees and they are sustaining their cost of operation through ads and donation. That exchange won't survive.