They’re great, but if the last 20-30 years of Open Source are any indication, most average people do not use Open Source, and beyond that, most don’t even know what it is.
The use of Open Source projects is mainly in corporations, while individuals using Open Source projects make up a small minority of the use cases.
I would love to see growth in that arena, but if the past is any indication, it will struggle to grow.
Further, as these may be considered “medically assistive devices” you run into the issue of possibly needing FDA approval to even distribute it.