Last year, Aetna ran into some headwinds at the Department of Justice in getting its proposed merger with Humana approved. 

So they resorted to a particularly unsavory trick: pulling out of the ACA exchanges, even in places where it was profitable for them to stay in. 

Despite their insistence to the contrary, a federal judge found Aetna used its exchange participation as leverage against the Obama administration to get its merger approved.

As you might remember, insurers pulling out of the exchanges was a major source of embarrassment for Obamacare.