Why no-one in America was arrested as part of a global sting on organised crime

More than 250 alleged criminal figures were charged in Australia after an international sting by the AFP and FBI involving an encrypted app. But not one arrest was made on American soil.
Read more: https://www.abc.net.au/news/2021-06-15/no-one-in-america-arrested-in-operation-ironside/100213036?source=Snapzu