On motorcycles, the rule to live by is All The Gear, All The Time. On mopeds, it's apparently Helmet With Maybe A Jacket. On electric scooters, it's Lol. The truth is that it should always be ATGATT on all 3. Going down on any of them is going to be exactly the same as going down at the same speed on a motorcycle.
One of the things you learn during rider training is that "stuck throttle" is usually panic freezing your wrist in place. Same goes for brakes that aren't working. I'll grant you that the scoots probably aren't maintained super well either, so it might be more likely there than on your personal machine.
All these rentals are adding up to just one thing: A lot more untrained, inexperienced motorcycle riders on the roads (and sometimes the sidewalks). The results are pretty obvious if you think about it.
Edit: Typo that I noticed.