You think that BNB is a stable cryptocurrency? Have you checked the BNB charts lately? A few days back, its price had went down by more than 10% in 24 hours. Are you willing to call such a cryptocurrency as a stable coin? I agree that Binance is one of the largest cryptocurrency exchanges out there (in terms of volume and diversity). But at the same time, BNB is just a token and not a full fledged altcoin.