I think in the last quarter of 2019 the Stablecoins are already showing some impressive performance. The Goldbacked Stablecoins and Fiat backed Stablecoins are dominant in the race. But in terms on legality I think Tether's USDT has a serious problem to tackle, IMO, Tether needs to clarify it because even me I'm also doubting If it was really backed by Fiat or dollar with a 1-1 ratio, Imagine it has billions of USDT in circulation thats why Tether should clear and clarify this first so that users won't doubting it anymore.