My wife is seriously considering a scooter (Even a non-electrified one) for her commute (2-3 days a week, 5 miles) - and I can't see a world where we'd rent one on the daily, as opposed to owning.
My uninformed guess is:
A problem with the rental model is the colossal inefficiency of having to pay people with cars and vans to drive around, and collect + charge scooters at the end of the day. This is a huge waste of resources and human time. Even with VCs p------ a firehose of money into the market, most of it ends up going to drivers, rather than customers.