Judging by the following part, it seems they'll at least try:

> That enforcement action was taken in coordination with the Ohio Attorney General’s Office, which brought a lawsuit under the Telephone Consumer Protection Act against several entities and individuals associated with the enterprise. The Commission also proposed a fine and offered the parties a chance to respond, which they did not do, resulting in today’s unprecedented fine. Should the parties not pay the fine promptly, this matter will be referred to the U.S. Department of Justice for collection.

But maybe the legal/justice system is so broken in the US that they'll just ignore it? Hard to imagine, but I don't live there so who knows.