Device drivers run in kernel mode and can bugcheck the machine. Microsoft can certainly provide tooling and help device driver writers write reliable drivers, but the device is still responsible for it's driver.
My understanding is that Windows supports user-mode drivers and Microsoft strongly encourages not writing kernel-mode drivers unless absolutely necessary. If Fitbit did that anyway though then it's definitely their fault.
Analemma_|9 years ago
planteen|9 years ago