There are a few issues at play here:<p>1. A lot of newly 'minted' Tether's are being used to buy Bitcoin (so prop it up, the Bitcoin price rises).<p>2. <i>Possibly</i> as a next step, these now more valuable bitcoins are than sold for real money, and the owners of bitfinex/tether pocket this real earned money as profit.<p>3. It should be noted that although the total amount of tether is still rising, the total amount of all "stable coins" is rising a lot faster, so basically, outpacing the growth of tether: the market seems to be on to them, and puts more trust in other stable coins. Personally, I like Maker's DAO decentralised SAI stable coin a lot. But preferences vary.<p>4. Why is there any demand at all for <i>any</i> stable coin? Can't a person just send/receive real dollars/euros? Answer: <i>No</i> .<p>There are a lot of unbanked people in the world, more than we in our western minds would dare to guess, I think.<p>Look at El Salvador: in 6 weeks since officially adopting Bitcoin as a currency (next to the US dollar, not <i>replacing</i> it mind you) the number of people that now have "wallet" software running on their phone is already lager then the number of people who over the past <i>20 years</i> were able to open a bank account.