Unraid is an example, that I consider fairly reasonable. Sure, it is a subscription.

But all of the services are docker containers. What unraid brings to the table is a nice management UI, and the ability to mix and match drive of different sizes in a single raid pool. It makes having a fairly resilient self hosting setup easier than trying to do all of this stuff from scratch.

Nice features sure, that many people find worth paying for, even if I don’t. But they are just nice to haves. If the company ever dies, it’s absolutely possible to export the data and move to say, portainer, or docker via the cli, or podman, or anything that can run containers.