I paid for the full, commercial free Version of Rocket Player. The Adds were gone, but after some time, they appeared again. So I uninstalled the Rocket Player and installed it again. Then it was adfree again.
But now - about 2 days ago, I joined the beta testing. In the beginning, everything was fine. But today, suddenly, the adds are back again, even though I payed. Right now I am using Version 5.7.64