Yep, it can use your Spotify account if you want to play mport your playlists and doesn’t have ads because it fetches the music from YouTube.
It looks like YouTube did something to their API and a bunch of apps that use it are not working, including Piped, but some solution is being worked on.
Yeah, bad timing on my end to recommend it lol. From the little I read on their GitHub, I don’t think the API change was intentional to break stuff, just so happens to do so, but I could be wrong. Hopefully it gets solved soon enough, at least there is already a pull request to that fixes it.