It’s been running on caddy + duckdns for 5 years or more now. I use a non standard jellyfin port for the port forwarding, so that probably helps. Also, there’s probably an aspect of security by obscurity.

I set up a free dns from duckdns.org and pointed it to my jellyfin server. All my parents had to do was to use that https://randomserver.duckdns.org/ as the server url in the jellyfin app.

Sure, that’s why Google made an exclusivity deal with wikipedia instead of reddit to train their ai for any organic user level reviews/discussions on anything.