Yeah, this was the only Google product that I really liked, and of course they're killing it just to force people to use YouTube Music. AntennaPod is an open-source alternative that functions very similarly, I've been using it for a couple of months now and I'm very happy with it.
Yeah, that was decent of them. I was expecting some sort of dark pattern bullshit to make exporting to a third-party extra hard, but it was actually pretty simple.