So this is the second Ecotric that came in the shop because the front tire came of on an early ride. In this case, I was able to replace the bent brake rotor and get it running (the rider ended with a broken wrist).
I consider Ecotric to be a value brand, that is, they are less expensive than more famous brands like RadPower and Aventon. And so it is with parts, in this case the spindle ends on axle appear to be knurled in such a way that you could adequately tighten with your fingers, but no!
On one side there is a 5mm hex hole that must be used to get adequate torque on the wheel. So you can certainly finger tighten the wheel when putting it in the fork, but you must then use your hex and in this case, you should use a wrench at least 6 inches long, and apply pressure at the end of the hex key till it feels good and tight. If you choke up as in the second picture, you may not be able to apply enough torque to keep this wheel on, which seems to me to be a problem with this design.