In the case of Tether, the company represented that each of its stablecoins were backed one-to-one by U.S. dollars in reserve. However, an investigation by the Office of the Attorney General (OAG) found that iFinex — the operator of Bitfinex — and Tether made false statements about the backing of the “tether” stablecoin, and about the movement of hundreds of millions of dollars between the two companies to cover up the truth about massive losses by Bitfinex.
also
Tether’s claims that its virtual currency was fully backed by U.S. dollars at all times was a lie.
The settlement also bars Tether from trading with New Yorkers, and the must submit regular reports about their compliance with this prohibition.
I suspect the AG got what they wanted, they just managed to do so without taking time in the court system. I would assume that Tether realized that it wasn't worth trying to defend themselves and so agreed to settle. My use of "successfully prosecuted" might not have been the right way to phrase it.