[lucb1e]

Seems unlikely/strange that all these clones would miss this little thing of using the derivative instead of the accelerometer directly so that it 'actually works'

> But the significance during motion sickness is the rate of change of the rate of change. That thing where the vehicle slows down, turns a corner, goes over a bump.

That's the same as being pulled towards the earth at 1 gee. Both are acceleration from the accelerometer's point of view. I'm not sure how to convey this well in text, but maybe try installing a sensor reader (e.g. https://f-droid.org/en/packages/de.rwth_aachen.phyphox/) and looking at how the accelerometer values change when you move it in various ways