They have a policy if the bikes don't work you can ship it back; however if you ride it that means you have to put gas in the bike. You can't ship the bike back unless you do some crazy hazard packing and shipping fees.
Getting back to why they get a 1 start. The bike was ridden 3 times and the bearings fell apart. The kill switch also broke off after press a few times. Cheaply made and cheap parts. That's what I get for buying cheap. I would expect this bike to at least last a week.
Spend a little bit more and buy at one of your local bike shop where you can actually test the bike.