The main benefits of having an EV right now is being able to charge overnight at home and less maintenance. You don’t get those benefits if you’re renting one on a trip.
The network and batteries are not where they need to be for rentals to make sense. They are close but still a few years away.
Once you can add around 300 miles of range in 15 minutes, and the charging networks are consistent, then it would make sense.
They are just better cars if you don’t drive a ton and can charge at home. I rarely use a public charger, I never have to change oil, my breaks will likely last the life of the cars, and the torque is great. I wouldn’t rent one if I were traveling, but I’ll likely stick to EVs next time I need another new car.