My guess is, they are letting Tether growing because whoever allowing this scam are also scammers themselves. See the FED and their trillion after trillion money printing. The FED prints to support the stock prices, BitFinex prints to support crypto. There is no difference. One scammer won't squeeze the neck of the other fellow scammer.
Have to agree with this. The growth in the market cap of Tether right now is really confusing for me, because hardly anyone I personally know are keeping their money in USDT. Most of these people converted back to BTC or ETH, as soon as the bull run started. So who is holding USDT right now? I just hope that if USDT collapses, then the SEC and FinCen won't use it as an excuse against greater regulation for Bitcoin.
Now coming back to Yellen, there was a statement from her three days back. In her statement, she claimed that "misuse" of Bitcoin is a "growing problem" and stricter regulations are needed to prevent it. She also said that the Blockchain technology shows a lot of promise. It is the same strategy from all these politicians. They are trying to paint cryptocurrency as something evil, and at the same time, showing a much more conciliatory stance towards Blockchain. What do they want? Ban cryptocurrencies and then promote their own CBDC shitcoin using the Blockchain?