Bosch are nasty in many ways though. Their ebike battery and motor system in particular is extremely hostile to diy anything. Repair, generic battery with Bosch motor, using your Bosch ebike battery outside the ebike, ...

I wouldn't mind seeing some legislation that forced compatibility between different ebike systems, especially battery DRM....

A good start would be strong push to unify all rechargeable batteries.

And not just bikes, but all the various tools, from cordless drills to lawnmovers.