I know it seems quite excessive... I still think it is a good resource that is dedicated and kept up-to-date. And the URL is just awesome, when I thought of it and found the domain, I had to get it.
Yes. One use case is to find the package name of an Android app, which is returned from an AndroidWebview in the "x-requested-with" header. This could enable you to show a banner to Android users only or even do simple A/B testing.
Thanks for noticing it. It was fine when I submitted it here. My DNS provider just crapped all over this by simply resetting to their default settings.