I downloaded the app to listen to a certain podcast, Infinite Wanderer (which is great BTW) and followed only one podcast and when I checked back later in the evening, since I kept getting push notifications that I also didn't sign up for, my profile page had 5 more podcast I follow only that I did not follow. The app downloaded podcasts from the 5 podcasts that I didn't follow or sign up for into my library. I unfollowed the 5 podcasts and deleted those podcasts that I did not download. Weird.