OP likes it too, unless he's being sarcastic. Really, it's hard to tell sometimes.
> The bit makes for a great favicon, and reminds us of the great work of early modernist painters. Left, Kazimir Malevich, Black Square, 1915. Right, Uber Favicon, 2016.
> Of all the brands based on squares, Uber's is the most exciting.
The comparison of the solid black square to famous art, and a description of the level of excitement about a brand "based on squares" where the brand is exactly only a square: those are the sarcastic components here.
These might even be interpreted as parody ("here is a great work of art by Uber, which is comparable in insight and execution to this work by a lesser known artist.")
> The bit makes for a great favicon, and reminds us of the great work of early modernist painters. Left, Kazimir Malevich, Black Square, 1915. Right, Uber Favicon, 2016.
> Of all the brands based on squares, Uber's is the most exciting.