Doesn’t get any more secure than a battle-tested web server hosting simple MP3 files and a text file.

Convenience might be a thing, though. I’m in the Apple ecosystem so their Podcasts app shows that feed on all devices and tracks listening progress, etc.

If I didn’t have that, I’m still a lifetime customer with PocketCasts and PocketCasts Web. So, that’s that. But if you don’t have anything similar in place, a self-hosted streaming server might be the best way to go, yes.