It’s shit for automating things and especially useless outside the Apple ecosystem, but it does offer the option to turn off sharing.
Apple ID -> Find My -> Share My Location
Since it’s closed source it’s possible they still capture the location and I would t trust it, but in practice anyone that you’ve allowed to see your location (for an hour, day, while on-route) gets a “location unknown” on their app of the toggle is off.
Replacement electric toothbrush heads run on the same scheme as disposable razors with high margins and vendor lock in. I’ve also seen vendors (Phillips) change the design to force you to buy another base station/brush.