alt Hacker NewsEMR patents and design specs expired. It's free. China's tooling simply hasn't caught up, because the output doesn't have to feel or work good, it simply has to look good in a kickstarter. Conjecture: I feel like this is like half the reason styluses as a technology are dying; the other half is the untimely death of the resistive display.
Bring back resistive touch!
Radio frequency/compatibility seems to be a consideration --- also, don't understate the importance of tooling/tolerances even w/ Wacom overseeing things, I've had to return name-brand/licensed styluses which would not work consistently across all of my devices.