IMO, people who buy dark coloured cars are stupid.

1. We're in Australia, where the sun be fair beaming and dark colours soak up heat way more than a more reflective|lighter colour
2. Visibility of dark cars is worse because they blend in to the bitumen and concrete background at the best of times
3. Whenever conditions are poor (rain, fog, dusk, whatever) it's by far the majority of dark coloured cars driving along without headlights on. My unscientific observation is that 90% of the cars you see in poor visibility without lights are dark coloured in any car shape. The other 10% are Toyotas which is probably because they have a dash that's always illuminated which makes it less obvious if you don't have your headlights on.
4. Dark colours look dirty about 4 seconds after washing them so you're either constantly wasting water shining up your piece of coal, or you're driving around in a dusty old bit of charcoal.

Your not the only one noticing. I remembered seeing this last year. Tldr, it's because money. https://www.drive.com.au/caradvice/a-sea-of-bland-what-happened-to-car-colours/

I only have a black car, because I picked out my options/colours from the factory, the color name had blue in it, the pictures of the color showed a blue car, and I wanted a blue car.

Turns out, this car is so dark that it only looks somewhat blue in very specific lighting.

I read this book a while back that makes an argument about this Is the same with houses of the wealthy: they are all white with muted greys, almost like an art gallery.

Chromophobia manifests itself in the many and varied attempts to purge colour from culture, to devalue colour, to diminish its significance, to deny its complexity. More specifically: this purging of colour is usually accomplished in one of two ways. In the first, colour is made out to be the property of some ‘foreign’ body - usually the feminine, the oriental, the primitive, the infantile, the vulgar, the queer or the pathological. In the second, colour is relegated to the realm of the superficial, the supplementary, the inessential or the cosmetic.

In one, colour is regarded as alien and therefore dangerous; in the other, it is perceived merely as a secondary quality of experience, and thus unworthy of serious consideration. Colour is dangerous, or it is trivial, or it is both. (It is typical of prejudices to conflate the sinister and the superficial.)

Either way, colour is routinely excluded from the higher concerns of the Mind. It is other to the higher values of Western culture. Or perhaps culture is other to the higher values of colour. Or colour is the corruption of culture. [...]

David Batchelor, excerpt from Chromophobia, London: Reaktion, 2000, p. 22-23.

My car is bright green.

I think it is getting a bit better, the last few years has seen slightly more colours come back. It's still largely boring but there are a few red, blue, and green cars around again instead of everything being grey, white, or silver. Grey can look rather nice on the right car but it's a bit much when every boring SUV joins in.

I'll note Mazda seemed to lead a bit of a resurgence a while back with red and that is a colour I do like, dark green is my favourite though (I've seen a few newish BMWs with a particularly nice dark green, I hope it starts a trend).