Here's a quote from the Play Store description for the app:
"- Get all the future updates for free: Once you purchase Poweramp, all the future updates are free to you as long as you have the Unlocker."
So, why are we now getting popup ads for paid features/updates in an app for which we paid for all future updates.
Don't get me wrong. I love the app. I have been using it and telling others to use it since shortly after its creation. I don't mind helping devs pay the bills. But, this is not the way to go about it. It is false advertising, irritating, and just plain wrong. This is how apps die.
