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Re:Micro Scisky: A 32-bit Open-Source Brushed Flight Controller by flexd on Monday November 20, 2017 @08:29AM (#15739726)
This article is very outdated. Small brushless quadcopters are readily available now. Such as the Hoverbot Nano [1] mentioned in another commment, or a Eachine Lizard [2], and lots more.

And you can go even smaller, such as a pepperfish [3]

This is a small brushless quad with 0703 motors with a 1 cell battery. https://i.imgur.com/EdFFfsc.png / http://rotaro.no 54mm in diameter

[1] https://hoverbot.io/ [2] https://www.banggood.com/Eachine-Lizard95-95mm-F3-FPV-Racer-... [3] http://fishpepper.de/projects/pepperf1sh/

Re:Micro Scisky: A 32-bit Open-Source Brushed Flight Controller by rimliu on Monday November 20, 2017 @10:08AM (#15740359)
And there are Tiny Whoops with BetaFlight compatible FCs.