Of course, it failed because it was getting some sort of GDPR page at the podcast feed URL. I'm wondering if there was some way around this, because it's not like podcatchers can opt into something via an RSS feed...can they? I'm pretty sure I passed headers only accepting feed content-types, but even that wasn't enough.
Sure I can host elsewhere, but I just didn't care enough about the project to do that. But if there's a way around this, then I might pick it up again.