The main drawback to electric scooters is safety and in many cases insurance of the vehicle. There are many statistics that will tell you that these are very prone to accidents and users tend to misuse them and ride over walkways and the like. I am not so sure you can escape the cost of crude as the cost of electricity has also increased everywhere.
Advice - if you buy one, let it not be chinesse.
In the united states, I think vehicles with an engine smaller than 50 cubic centimeters in displacement, usually do not pay insurance. That's one advantage to the 50cc moped bracket. Mopeds are fuel efficient and another good option for avoiding high gas costs.
Some US states have little or no regulation for electric scooters and bikes. There may be no insurance requirements. I think the determining factor is the watt power of the motor. In some regions a motor with less than 500 to 1,000 watts of power will require no licensing or insurance. While larger and more powerful vehicles, might be require a valid driver's license or insurance of some type.
There are accounts on youtube who buy scooters, bikes, motorcycles, mopeds and review them. Its good to check reviews there to see if someone else bought it 1st and get a reaction for what their experience was.
I think most accidents stem from people not exercising proper caution, going too fast in areas with many pedestrians. Not following the rules of the road.
Even before electric scooters became common, bicyclists have always had a difficult time with safety. Partly due to them being so quiet that people do not notice them. Many drivers listen for the sound of an engine and if they don't hear one, they assume its safe to back out of their driveway. Causing them to hit the scooter/bicycle that was moving past.