There are other big, people-carrying drones. eHang was probably the first, in 2016. They've actually sold a few. Price is above US$300K. They routinely fly above cities.
Like everybody else, they're battery-limited. Their limit is about 30 minutes.
All those un-shrouded spinning blades at low height are worrisome.
eHang was not the first, but they do seem to have good marketing.
German company Volocopter flew a manned demonstration rig in 2011 (the famous pilates ball [1]), and had the first manned flight of the Volocopter multicopter (certified, 18 rotors) in February 2016, with the CEO himself flying [2].
I don't know when the eHang 184 flew first (a video on youtube says Feb 2018 [3]). Personally, I find the design (with 8 rotors in a quadratic arrangement at knee-height, perfect for decapitating pedestrians) atrocious. (The Volocopter blades are above the cabin, as in a helicopter.)
And where do you get the 30 minutes endurance for the eHang from? When I divide the range by the cruise speed from Wikipedia, I get about 8 minutes endurance.
https://explorersweb.com/jetson-one-giant-passenger-drone/