The post linked from the readme mentions it: https://smallcultfollowing.com/babysteps/blog/2018/04/27/an-... , although it's two years old at this point so I wouldn't be surprised if things have changed.

It's not the 2 years that caused the change. Feel free to read up on Frank's blog post about how datafrog came into existence: https://github.com/frankmcsherry/blog/blob/master/posts/2018...