Want a hint?  They’re all imaginary.

There’s no such thing as a monopoly on a truly open source hardware project.  So what if someone cornered the market on some critical widget?  The plans are open source and your options are infinite:

• Build your own widget.
• Hire someone to make it for you.
• Design an alternate part.
• Design a new assembly using more available part.
• Hack a work around until you can get the part.

Or, my personal favorite:

• Start your own business producing and selling that very same critical widget.

These are not problems.  These are opportunities for creativity and innovation.