This isn't at all surprising given the high volume on Binance, there's just more scope for profitability. Couple that with an attractive fee structure compared to some competitors.
For daily or regular traders fees is very important and if this is the minimum as compared to the other exchanges then daily add up a good amount at the end of the month . So today we have so many people who are doing this full time and some credit goes to binance which is making it possible .