I don't think Medtronics ever intended for their life safety device to be built in someone's garage. I rather expect they released the design for major companies (General Motors, Ford Motor Company, et al) to get a head start on complying with President Trump's order that they begin manufacturing ventilators rather than automobiles.
It would take years for those major manufacturers to come up with a design that could be approved and Medtronics, to their credit, just shortened the startup time.
Picking on Ford and GM was based on the idea that these companies can manufacture a LOT of product. They have the machine tools, they have the machinists, they have engineering and procurement plus they have money. What they need is something to work on. Now they have the design of a device that is already FDA approved. Copy and Paste!
All that assumes that the BOM stuff is actually available and, of course, they would be competing with Medtronics for those components. I think the real problem is going to be with the small parts manufacturers. Maybe Ford or GM will have to buy those companies and kick up the production rates. Automobile manufacturers understand volume.
Life safety based on Open Source? Really? I'm going to trust a machine built in my neighbor's garage? Have any of these builders though about the amount of liability insurance they're going to need?
I suppose Arduinos will show up here as well.