Surprisingly, there was no explanation for the choice of dark blue. Probably assumed that it would look good with the rest of the interface after all blue is the main colour of the social network.

Dorsey also mentioned that it would be great if the operating systems had a dark-mode activation function that encompasses all applications. There have been some signs that Google will be able to implement this function in the upcoming Android Q. However, it would be quite difficult to implement this natively and ensure that third-party applications work well.

In conclusion, the dark mode is an increasingly essential function in applications. Personally I have always been active in all the applications they support as I consider their actual benefits.