The idea of the cheap-o online bikes is you are saving all your money initially so you can spend it later on. You aren't paying money for any quality or support you are just getting a cheap pile of parts probably thrown together by the lowest bidder. They know their bike is likely to have problems but they don't want to be around when you have them. Bosch for instance supports their product really well. I can generally call them or email and get a quick response and support. We have a customer who had a bad motor and his bike is beyond warranty but they are replacing it because they support their product.

That particular bike is not Fixed or freewheel it is Nexus3 hub. I am guessing Luna is charging a huge premium for a belt drive and possibly non-removable but integrated low WH battery. That bike doesn't look worth anywhere near $1750 with zero warranty and relatively cheap parts. The one saving grace is at least this is a mid-drive bike, not a quality mid-drive but a mid-drive none the less.