Player FM keeps in sync with the publisher's feed, so if old episodes aren't there, it may be because the publisher removed them from their feed. We might later experiment with keeping them around, subject to publisher approval. But it would still need a warning flag because we cannot guarantee that the publisher still serves the episodes if they've removed them from their feed. Often, they still are served and only omitted from the feed to keep the feed small. Yet other times, they will have removed the files from their server.