Yeah, I' been following the various projects, too. As far as I can see, many people underestimate that ventilators are just one necessary tool of many in intensive care. Sure, you can whip up a proof-of-concept prototype using a bag-valve mask, a stepper motor, and an Arduino. However, most COVID-19 patients will be multimorbid and require lots of attention. As multiple healthcare experts have mentioned so far, the real bottleneck are highly-qualified intensive care doctors and nurses.

Do you really want to give these people a new ventilator with which they are not familiar, which may lack features they need, and which might break down or malfunction in an unfortunate moment?

Maybe there is a place for such simple ventilators outside intensive care, e.g., as support for people who are able to breathe on their own and do not necessarily require mechanical ventilation, AND who are in a place without nasal O2 supply?