The difference is that you're using a USB port directly built into the car (which is "smart" about not draining the battery) while the other user is using a cigarette lighter to USB adapter (the cigarette lighter is a "dumb" circuit).
If it's not a car from the 80s there may be a fuse you can add/remove which converts your cigarette lighter from always on to only when engine is on. Check the back of your car manual.
I leave a phone plugged into my car's USB port 24x7 and the car has its own GSM modem too and obviously it starts right up every time.