Who can tell me the meaning of 'make drones' in the following?
Here is the context: The U.S. and other countries have seen a flurry of apps that are inspired by Meitu, the Chinese app that pretties up selfie photos. American startups are copying China's fleets of on-demand bicycle rentals for getting around crowded cities. Apple and Facebook are trying to remold their messaging apps in the image of China's ubiquitous WeChat. Before there was Tinder for hookups, there was similar dating app Momo in China. Every company that makes drones is following the lead of China's SZ DJI Technology.
Is it used as a metaphor? If so, what is compared to what?