These are such a terrible idea, mostly because of the noise. Imagine a world where these become even halfway popular in any urban environment....
Cars already cause huge noise pollution in cities, which has large-scale effects on health and well-being, but anything using rotors to stay airborne makes cars seem comparatively quiet.
Air taxis are sort of like adding a thumb drive because you've run out of space on your HDD and SSD.
The number of people you can move with eVTOL is just tiny compared to the throughput you'd need to dent traffic.