The design would be worth billions, if you add in a bunch of investment money. (which would flow to a contest winner) And the $20k easily pays back the materials cost of a garage/makerspace-built prototype.
That's why I included the bit about "absolutely no loss of patents or copyrights, or grants of license to amazon, for anything related to the robot." bit.
The value of something that is good enough to win the prize is far larger than the prize. If you can compete without compromising your control of your entry in any way, it only costs the time of whoever you send to unpack the robot and participate. If touching the contest involves granting any right to your entry, you should probably run away screaming.
Abort that fetus today, you could save a diabetic person's foot...
They may have other uses; but fetuses old enough to abort are not a good supply of embryonic stem cells (all those adorably baby-like features you see on the gory antiabortion posters? That's because the cells have already differentiated and lost most of the really cool capabilities of early stage embryonic cells...)
If you want to do your part for the stem cell industrial complex, get some IVF done.
"God is a comedian playing to an audience too afraid to laugh." - Voltaire