> There are so many things that can go wrong

Are there? My impression is that basically the only thing that can go wrong with ultrasound is they pump too much energy into you, and as risks go that seems both difficult to screw up and easy to make sure you don't screw up.

The imaging might be useless, but then that's why it's a spa treatment. I assume the primary use cases for this are (at least until it's developed a lot more seriously) "cute" non-medical baby images and body composition - the former of which can't really go wrong and the competition for the latter is a scale with some electrodes making shit up anyways.