Sure, as it reduces overall filesize. They could have achieved similar efficiency by compressing full-color images though.

Or they can do away with some of the useless images and save a lot more bytes.

> The main challenge was to reduce page size without making the website less attractive. Because images take up most of the bandwidth, it would be easy to obtain very small page sizes and lower energy use by eliminating images, reducing their number, or making them much smaller. However, visuals are an important part of Low-tech Magazine’s appeal, and the website would not be the same without them.