Some of the reasons for the development of this project were mentioned by one of the developers when the Redis HyperLogLog support was discussed on Hacker News:

Some of the reasons for the development of this project were mentioned by one of the developers when the Redis HyperLogLog support was discussed on Hacker News: https://news.ycombinator.com/item?id=7506774#up_7508861 https://news.ycombinator.com/item?id=7506774#up_7508861 > We sacrificed durability, accuracy, and some level of safety [...] for raw speed. It comes up a lot as being used by various ad companies to track all their counters.