New York CNN  —  Howard Lutnick, the Cantor Fitzgerald CEO who’s been tapped to run the US Commerce Department , has in recent years become a prominent cheerleader for Tether, the company behind one of the world’s biggest crypto assets. But even by the standards of crypto — an alternative financial ecosystem in which some of the biggest frauds of the 21st century have taken place — Tether is a murky entity that has been dogged by investors’ concerns about its operations. It is effectively an