I'm highly skeptical that they will sell 20k units at that price point.
What am I missing?
(Vested interest as a diabetic myself.)
My wife is a diabetic and this kind of stuff, while it seems minimal, makes a big difference for her quality of life.
If you're not familiar, here's a good starting point:
https://androidaps.readthedocs.io/en/latest/
Oh, and you want to avoid Apple's hardware. Some of the software can only be distributed as source code, so installing them to an iOS device is not easy.