Back to the coming Apocalypse, this paywalled story in Bicycling Fall 2023 is pretty chilling! It doesn't really concern eMTBs, but focuses on mass market E-Bikes and how their components tend to be cheap and way overmatched for the speeds these bikes go. Specifically, there's often a dangerous combination of mechanical disc brakes and quick release front wheels, in particular. Couple that with casual users that don't usually do maintenance...and you can see where that's headed. This article tells a cautionary tale about a 12-yo girl in SoCal that died after crashing a Rad Power Bike.
I now find myself compelled to bring it up to anyone I meet with an e-bike.