From Black & White to Brown & Blue

Start with a Google image search on 'chess fischer'; select a few black & white photos; feed them to a colorizing service. You get something like the composite image shown below.

Colorize Black and White Photos – Algorithmia

The header for that page (on algorithmia.com) says,

Colorize Photos • Use Deep Learning to Automatically Colorize Black and White Photos

A little later, the page says,

We're excited to introduce cloud hosted deep learning models on Algorithmia. The Colorful Image Colorization microservice is a computer vision algorithm trained on a million images from the Imagenet dataset.

Does the Imagenet dataset consist mainly of brown & blue photos? The USA and USSR flags in the photo on the bottom right might be the reason why that image shows a few other colors.