The banking system is behind most of the cryptocurrencies. They want to familiarize us with crypto, it is the first step to make us accept the CBDCs, which was always the plan. I already hear many crypto libertarians saying: "I use USDT because it's more convenient, the value is stable" 
I guess you are totally wrong on this statement of yours, because the banking system has never been behind any cryptocurrency, nor owned any cryptocurrency. But if what you meant is that banks are behind all Central Bank Digital Currency "CBDC" just like the digital rupee & E-naira, then it's agreeable, because there is a huge difference between these two. CBDC are the digital form of a nation currency built on the blockchain to enable easy transaction, controlled by its central bank and the government. And secondly, USDT is not a CBDS but a stable cryptocurrency pegged to the American digital dollar