In addition to blogs, RSS is used by podcasts. If you use an app like Spotify, you’re not using RSS, but rather their internal API, which tracks how much of the show you listened to, etc. If you use an RSS based app (overcast is my favorite), you’re often going to be subscribing via an RSS feed.

For podcasting, RSS has advantages and disadvantages. The upside is that it’s about as private as possible. You do show up on someone’s radar when you download episodes, but your podcast player isn’t sending detailed information that can identify you or your listening habits. The disadvantage is mainly for podcasters publishing on RSS: it’s very hard to tell how many listeners you have, and how active they are.