I have a lifetime subscription, I use plex to share the media with the wife and kids on all of our devices, it does the job. I won't bitch about their streaming ambitions, but doing automatic updates and taking security seriously would go far for them.
With containers it's a questionable/clunky implementation but possible. It only works in one flavor of their official image. On startup it will check if there is an update and download it and replace the application in the container. It breaks the point of containers obviously. It also only runs on startup, so you need to restart the container to get it to run.