Why mini velo is so popular?

Could you elaborate on the phenomenon of why mini velo bicycles have become so popular? Is it due to their compact size, making them ideal for urban environments where space is limited? Or perhaps it's the retro styling that appeals to a certain demographic, evoking a sense of nostalgia? Are they more affordable than traditional bicycles, allowing for wider accessibility? Or does it have something to do with their unique features, such as their lightweight frames and efficient brakes? I'm curious to understand the driving forces behind this growing trend of mini velo bicycles.