Frankly the blocking is a radius around the start and stop points. If they are both at your doorstep, all your rides will extrapolate to points on a circle with a center very easy to determine. The feature as it is, is snake oil for someone determined enough. I started to start and stop my rides some distance out, just to add some variation.
The hidden address feature picks a random centroid near your hidden address, not exactly on it. Averaging out the circle finds that random centroid, not your hidden address.
