I would ask about your Budget. DJI Drones are priced very cheap so as far as "competition" for the type of Drone you will be hard pressed to find anything close.
DJI however is not the industry standard for filming. If you want to pursue a...
Have you tried the obvious yet? A drop of either WD40 or watchmakers oil on the tip of the metal spindle followed by gentle and repeated downward pressure on the plastic rotor hub to encourage release.
There is a metal compression spring beneath...