@Gravatai at Poloniex Tron is used to pay commissions because Justin Sun bought (I don't know if all or in part) Poloniex a few years ago. But sadly, Poloniex no longer has the "glory" it had in 2015 or 2016, although it still has a pretty good daily volume (5258 BTC), the emergence of Binance made it fall. Tron has the potential to grow a lot and is showing it every day. Patience.