If you want to clear out any stopped containers, orphaned images, networks, etc run “docker system prune”
What I think is happening is there is a persistent volume mount that needs to be cleared out. If you’re using the docker run command with a -v flag, check the host path. It’s likely there are saved configurations you’re passing into the container.
Yep it’s not simple, but also not too difficult. Get a domain name and set up DNS. Open 80/443 on your router, use linuxserver.io’s SWAG container for easy automatic cert generation/renewal and nginx reverse proxy to access your hosted services. Have a decent upload speed. That’s about it
OP clearly states in the post they are using a modified APK to get premium access without paying