This is the key question, in my mind. There's only one reason I'd want to own the hardware—to manage/add/create my own services and handle my own backups because I don't trust a company's involvement in these[0].
If this is so tightly controlled that I can't add my own services and I can't restore a backup without Helm's involvement, why do I even want the hardware?
[0] I don't mean that I don't trust them in a privacy sense. I mean that I don't trust them to make sure the backups are actually working and able to be decrypted and restored. Or be able to be restored without their software/hardware. There doesn't seem to be any transparency wrt/ these concerns.